Motherboard Guide
The motherboard is the foundation of your PC. Explore the key platforms, features, and considerations to choose the right board for your build.
Click a board to learn about its size
Intel
Great for a wide range of builds and often paired with Intel Core processors. Feature sets vary by chipset, so it is important to confirm compatibility and connectivity.
AMD AM4
A mature and budget-friendly platform with a large selection of compatible Ryzen processors and boards. Great for value-focused upgrades and builds.
AMD AM5
AMD's newer platform with support for current Ryzen CPUs and newer technologies. AM5 uses an LGA-style socket, meaning the motherboard socket has the contact pin field. A strong option for longer-term upgrade potential.
Compatibility
Ensure your CPU, memory, and other components work together.
Chipsets
Different chipsets offer different features and capabilities.
Memory Support
Check supported RAM types, speeds, and capacities.
Expansion
Look for the right slots and ports for your needs.
Installing your CPU
Seating a processor is the step people are most nervous about, and the one where a mistake is most expensive. It takes about a minute once you know what you are looking at: line up the marker, lower the chip in flat, and let the retention arm do the work.
- Match the triangle on the corner of the CPU to the triangle on the socket
- Never force it. The chip drops in under its own weight — if it needs pressure, it is misaligned
- Intel sockets have the pins in the board; AMD AM4 has them on the chip. Both bend easily
- Fit the cooler within a few minutes of applying thermal paste
Updating your BIOS
A BIOS update is what lets an older board recognise a newer CPU, and it fixes memory stability problems more often than any other single step. It is safe when done properly — the one rule is never to cut power partway through.
The standard method
- Find your exact board model and revision. It is printed on the board itself and on the box. Revisions matter — a file for the wrong revision will not flash.
- Check the version you are on. Press Windows + R, type
msinfo32and look at BIOS Version/Date, or read it on the BIOS screen at boot. - Download the file from the manufacturer's support page for that board only. Read the release notes — they tell you which CPUs a version adds.
- Copy it to a USB stick formatted FAT32, unzipped, in the root folder.
- Enter the BIOS at boot (usually Del or F2) and open the built-in flash tool: EZ Flash on ASUS, M-Flash on MSI, Q-Flash on GIGABYTE, Instant Flash on ASRock.
- Select the file and wait. Two to five minutes, several restarts. Do not touch the power. Afterwards, load optimised defaults and re-enable XMP or EXPO.
BIOS Flashback — updating with no CPU installed
Most mid-range and higher boards have this, and it is the feature that saves a build when the board is too old to post with the CPU you just bought. It runs off the power supply alone: no CPU, no memory and no graphics card need to be fitted.
Look for a small button on the rear I/O labelled BIOS Flashback, Flash BIOS or Q-Flash Plus, next to one specially marked USB port.
- Put the BIOS file on a FAT32 USB stick. Rename it exactly as the manual says — ASUS boards need a specific filename, and most vendors supply a renaming tool.
- Connect the 24-pin and 8-pin power cables. Leave the PC switched off at the button.
- Insert the stick in the marked port and hold the button for about three seconds.
- The LED blinks while it writes and stops when it is finished. That can take up to eight minutes — do not interrupt it.
Debug LEDs — what the board is telling you
If a build does not post, the board usually says why. Most modern boards have four small labelled LEDs near the 24-pin connector. Whichever one stays lit is the stage it got stuck on, and that is the component to check first.
Higher-end boards add a two-digit POST code display. Look the code up in the manual; it narrows the fault down further than the LEDs alone.
2 DIMMs or 4? And does faster memory matter?
Nearly every consumer motherboard has four memory slots but only two channels. That single fact explains most memory advice you will read.
2 DIMMs
One stick per channel
- Runs at higher stable speeds — there is less electrical load on the CPU's memory controller
- Gets full dual-channel bandwidth, same as four sticks
- Leaves two slots free to add capacity later
- Fit them in the slots the manual names — usually A2 and B2, the second and fourth from the CPU
4 DIMMs
Both slots per channel filled
- More total capacity, but often at a lower speed — boards commonly derate 4-stick configurations
- Harder on DDR5, where four sticks may not reach advertised speeds at all
- Mixing kits bought separately is the usual cause of boot failures
- If you need 64GB, 2 x 32GB beats 4 x 16GB almost every time
So why pay for faster memory?
Because for some workloads it is genuinely free performance, and for others it is money you will not notice. Where it matters:
- Ryzen benefits the most. On AM5, memory speed is tied to the fabric linking the CPU's internal blocks. DDR5-6000 is the accepted sweet spot — faster kits often run out of sync and end up no quicker.
- CPU-limited gaming. At 1080p with a strong graphics card, faster memory can add real frames. At 4K the graphics card is the limit and memory speed barely registers.
- Latency matters as much as the number. A DDR5-6000 CL30 kit can beat a DDR5-6400 CL40 one. Compare both figures, not just the headline speed.
- You must switch it on. Memory runs at a slow default until you enable EXPO (AMD) or XMP (Intel) in the BIOS. A kit you paid extra for and never enabled is running at the same speed as the cheap one.
Compatibility — the five things that actually catch people out
Almost every "it will not turn on" call traces back to one of these. Check them before ordering, not after.
CPU and socket
The socket must match exactly, and that is not enough on its own — check the board's CPU support list for your specific chip. An older board may need a BIOS update first, which is exactly what Flashback is for.
Memory type and QVL
DDR4 and DDR5 are physically different and not interchangeable. Check the board's QVL (the tested memory list) for your kit, and remember that four sticks may run slower than two.
Case size and form factor
ATX, Micro-ATX and Mini-ITX descend in size, and a case only takes the sizes it lists. A smaller board always fits a larger case — never the reverse.
Clearances
Three measurements decide whether the parts physically fit: graphics card length, CPU cooler height, and radiator size. All three are listed on the case's product page.
Power connectors
The board needs a 24-pin and at least one 8-pin CPU cable — higher-end boards want two. Confirm your power supply has them, and that it has the right connector for your graphics card.
Common motherboard issues, and how to fix them
The five problems our PC Support team sees most, with the checks that resolve them. Work down each list in order — the simplest cause is usually the real one.
Core Concepts
The five things that matter most when choosing a motherboard.
- It is your PC’s central hubThe board connects every component and determines which processor, how much memory, and how many drives and cards your build can take.
- Socket firstThe socket must match your chip exactly — AM5 or AM4 for AMD, LGA 1851 or LGA 1700 for Intel — and the BIOS may need updating for a newer CPU.
- Chipset sets the ceilingHigher tiers add USB and PCIe lanes, stronger power delivery, faster memory support, and overclocking. Entry chipsets are good value for straightforward builds.
- Form factor must fitATX offers the most expansion slots, Micro-ATX fewer, and Mini-ITX just one. Your case lists the sizes it accepts.
- Plan your upgrade pathCount M.2 and PCIe slots, check DDR4 vs DDR5 support and the QVL for tested memory kits, and confirm whether Wi-Fi and Bluetooth are built in.
What Customers Ask Us
Five questions our PC Support team is asked most about this. Tap any one to open it.
How do I know a processor will work in my motherboard?
Two things have to line up. First the socket — LGA 1851, LGA 1700, AM5 or AM4 — which is printed on the board’s product page and in its manual, and a chip only fits the socket it was built for. Second the BIOS version: a board made before your processor launched may need an update before it will start with it. Every board maker publishes a CPU support list for the exact model that shows both, and that list is the thing worth checking before you order.
Do I need to update the BIOS for a newer processor?
Often yes, if the board is older than the chip. The board maker’s support list names the minimum BIOS version for each processor. The awkward part is that you normally need a working processor to run the update — which is why BIOS Flashback exists on many mid-range and higher boards: it updates from a USB stick with no processor, memory or graphics card fitted, using a marked port and a button on the back panel. The one rule either way is never to cut the power partway through.
Will any memory work in my motherboard?
No, and there are three separate limits. The generation must match — DDR4 and DDR5 use physically different slots and are not interchangeable. The capacity has a ceiling set by the board and processor. And the speed a kit will actually reach depends on the board, the processor’s memory controller and how many modules you fit. Your board’s Qualified Vendor List names the kits the maker tested in that exact model, which is the lowest-risk way to choose.
What are the most common motherboard installation mistakes?
Four come up repeatedly. Standoffs — the brass spacers between board and case — must be fitted under every screw hole and nowhere else; a spare one under the board can short it. The 8-pin processor power cable is easy to seat only halfway, which looks connected and will not start. Memory goes in the pair of slots the manual names, not the two nearest the processor. And the small front-panel plug for the power button has to be on the right header pins or the case button does nothing.
Does my board have Wi-Fi and Bluetooth, and can I add them?
Check the model name first: many makers append WIFI or AX to boards that include it, and the specification page lists it outright. A board with it will have two small screw-on aerial connectors on the back panel. If yours does not have it, you can add it afterwards — either a card in a spare PCIe slot or a USB adapter, both of which work fine. A board with it built in generally has better aerial placement.
Last Updated: July 2026 | Newegg PC Support — Motherboard Buying Guide
How Intel chipsets work
The chipset is the code on the box — Z890, B760. The letter is the tier and the number is the generation. It does not change how fast your processor is; it decides what the board can do.
Only Z boards let you overclock the CPU. B boards can still run fast memory profiles.
How many M.2 drives, USB ports and expansion slots the board can offer.
The tier and the board’s own design decide how fast a memory kit will run reliably.In plain terms: pick the socket your processor needs first, then the tier. Most people are best served by a B-series board — the Z tier only pays off if you overclock or need a lot of drives.
Which tier?
Higher is not automatically better — it is about what you need the board to do:
Check the socket before the chipset. A Core Ultra chip needs an LGA 1851 board (800-series). A 12th–14th Gen chip needs LGA 1700 (600/700-series). The tier letter cannot bridge that gap.
Worth knowing
Two things that catch people out:
Business and workstation fleetsW880 and Q870 boards add remote-management and ECC memory support.
Not faster for games, and rarely sold to home builders.
Two boards, same chipsetPower delivery, heatsinks, networking and BIOS features vary enormously at the same tier.
Cheapest board with the right chipset is not automatically the right board.
Short version: match the socket, then choose B-series unless you have a specific reason to go Z.
How AM4 chipsets work
AM4 is AMD’s older socket and it uses DDR4 memory. It is still capable and inexpensive, and the letter-plus-number code works the same way: the letter is the tier, the number is the generation.
AM4 boards take DDR4 only. Cheaper memory, but it is the end of that road.
Unlike Intel, AMD allows CPU overclocking on B and X boards, not just the top tier.
Whether the graphics slot and M.2 run at PCIe 3.0 or 4.0 depends on the chipset.In plain terms: a B550 board is the sweet spot — PCIe 4.0 where it matters, overclocking allowed, and widely available.
Which tier?
Higher is not automatically better — it is about what you need the board to do:
The BIOS is the thing to check. An AM4 board made before Ryzen 5000 may need a BIOS update before it will start with a newer chip. The BIOS section below covers how, including updating with no CPU fitted.
Worth knowing
Two things that catch people out:
Update before you swapCheck the board maker’s CPU support list for your exact model and revision.
A board that will not post with a new CPU is usually a BIOS problem, not a fault.
DDR4 onlyAM4 and AM5 memory are not interchangeable, and neither are the sockets.
Buying DDR5 for an AM4 board is one of the most common ordering mistakes.
Short version: AM4 is the budget route. B550 for most builds, and check the BIOS version first.
How AM5 chipsets work
AM5 is AMD’s current socket and it uses DDR5 memory. Same code system — letter for tier, number for generation — with one extra wrinkle: a trailing E means more PCIe 5.0.
AM5 takes DDR5 only. Two sticks generally run faster and more reliably than four.
Higher tiers extend PCIe 5.0 to the graphics slot, not just storage.
AMD has committed to supporting AM5 for years, so the upgrade path is real.In plain terms: a B650 or B850 board suits almost everyone. Step up to X only for the extra slots and USB4.
Which tier?
Higher is not automatically better — it is about what you need the board to do:
Two letters do a lot of work here. An E (B650E, X670E) adds PCIe 5.0 for graphics. And B840 is the odd one out — despite the higher number it does not allow CPU overclocking and runs PCIe 4.0 for graphics.
Worth knowing
Two things that catch people out:
What the E meansE boards route PCIe 5.0 to the graphics slot as well as storage.
Almost no current graphics card is limited by PCIe 4.0 today, so this is headroom for later rather than a difference you would notice now.
Check the memory QVLThe board’s qualified vendor list names the memory kits it was tested with.
DDR5 is fussier than DDR4 — a kit off the list is the safest choice.
Short version: AM5 is the platform to build on now. B650 or B850 for most people; read the letters carefully.
Form factors, plainly
Board size is a physical measurement, not a performance tier. A Mini-ITX board with a Z890 chipset is exactly as fast as an ATX one — you just get fewer slots and less room to work.
The main thing size buys you. Smaller boards have fewer places to plug cards in.
Full-size boards normally have four; the smallest usually have two.
The case lists which sizes it accepts. A bigger case takes smaller boards, never the reverse.In plain terms: build ATX unless you specifically want a small PC. It is cheaper, easier to work in, and has more room for cooling.
Which size?
Higher is not automatically better — it is about what you need the board to do:
The case decides, not the board. Check the case specification for the sizes it supports, then buy a board that size or smaller. Also check the case’s limits for graphics card length and cooler height.
Worth knowing
Two things that catch people out:
E-ATX and biggerWider boards for very high-end and workstation builds.
Only fits cases that name E-ATX explicitly — check before ordering.
Match the case specStandoff positions are shared, so a smaller board bolts into a bigger case.
A board larger than the case supports simply will not fit.
Short version: size sets your slot count and what case it fits. ATX for most builds, Mini-ITX only if small matters.
The fans spin up but nothing appears on screen
The board is getting power and the fans are turning, so this is usually about the display path or a part that has not seated properly — not a dead machine.
Usually one of these: the monitor cable is in the wrong socket, the graphics card is not fully seated, a memory module has worked loose, or the board is showing a debug light.
Try these in order
Before you open the case: shut the PC down, unplug the power cable, hold the power button for about ten seconds to discharge it, then touch a bare metal part of the case to ground yourself. Never open the power supply itself, and never test or probe anything while it is plugged in.
- Check which socket the monitor is plugged into. If you have a separate graphics card, the cable must go into the card at the bottom of the back panel — not the sockets built into the board higher up. This is the single most common cause.You should see: A picture appear, or at least the monitor stop saying “no signal”.
- Check the monitor itself. Make sure it is on the right input, and try its supplied cable in case the current one is faulty.You should see: The monitor wake up when it finds a signal.
- Look for a lit debug LED on the board. Most boards have four small labelled lights near the 24-pin connector: CPU, DRAM, VGA and BOOT. Whichever one stays lit is the stage it stopped at.You should see: One light stay on, which tells you which part to look at next.
- Reseat the memory. Open the clips, take each module out and press it back in until both clips click. With two modules, use the second and fourth slots from the processor unless the manual says otherwise.You should see: The DRAM light go out, or the PC reach the BIOS screen.
- Reseat the graphics card. Release the clip at the end of the slot, remove the card, then press it back in firmly until the clip closes. Check its power cables are pushed fully home.You should see: The VGA light go out and a picture appear.
Still stuck? Stop there rather than forcing anything. Use Chat with PC Support or Request a Callback on this page and tell us which of these steps you have already tried — it saves repeating them.
Nothing happens when I press the power button
When absolutely nothing moves, the cause is almost always power reaching the board or the button itself — not a failed component.
Usually one of these: the power supply switch is off, the wall socket or cable, the front-panel button wires are on the wrong header pins, or a power cable is not fully seated.
Try these in order
Before you open the case: shut the PC down, unplug the power cable, hold the power button for about ten seconds to discharge it, then touch a bare metal part of the case to ground yourself. Never open the power supply itself, and never test or probe anything while it is plugged in.
- Check the switch on the power supply. It is on the back of the PC next to where the mains cable plugs in. I is on, O is off.You should see: Case lights or fans respond when you press power.
- Try a different wall socket and cable. Plug something you know works into the same socket to rule it out.You should see: The PC show some sign of life.
- Check the two large power cables into the board. One 24-pin along the edge, and one or two 8-pin near the processor. Push each until it clicks — a partly seated 8-pin looks connected but is not.You should see: A firm click as each seats fully.
- Check the front-panel button wires. The small two-pin plug labelled PWR_SW must be on the pins the manual names. If it has been knocked off during a build, the button does nothing.You should see: The PC start when you press the case button.
Still stuck? Stop there rather than forcing anything. Use Chat with PC Support or Request a Callback on this page and tell us which of these steps you have already tried — it saves repeating them.
The PC does not see all the memory I installed
Memory is the most common reason a build will not start, and it is usually seating or slot choice rather than a faulty module.
Usually one of these: a module is not fully clicked in, the modules are in the wrong pair of slots, a memory profile is set too fast for the kit, or two separate kits are being mixed.
Try these in order
Before you open the case: shut the PC down, unplug the power cable, hold the power button for about ten seconds to discharge it, then touch a bare metal part of the case to ground yourself. Never open the power supply itself, and never test or probe anything while it is plugged in.
- Reseat every module. Open both clips, remove it, line up the notch and press down evenly on both ends until the clips close by themselves.You should see: A click at each end, and both clips upright.
- Use the slots the manual names. With two modules that is normally the second and fourth from the processor. The wrong pair costs you speed and can stop it starting.You should see: All the memory appear at the BIOS screen.
- Test one module at a time. Fit a single module in the slot the manual specifies for one-stick use, and start the PC. Repeat with the other.You should see: Each module start the PC on its own, which tells you whether one is at fault.
- Turn the memory profile off temporarily. In the BIOS, set XMP or EXPO to disabled so the memory runs at its default speed.You should see: The PC start reliably — if it does, the kit was being asked to run faster than this board and processor manage together.
Still stuck? Stop there rather than forcing anything. Use Chat with PC Support or Request a Callback on this page and tell us which of these steps you have already tried — it saves repeating them.
The board will not start after fitting a newer processor
A board made before your processor existed does not recognise it until its BIOS is updated. The machine may show a CPU debug light and do nothing else.
Usually one of these: the board’s BIOS is older than the processor, or the processor needs a different socket than the board has.
Try these in order
- Confirm the socket matches first. Check your board’s product page for its socket and compare it with the processor. If they differ, no update will help.You should see: The two names match exactly.
- Check the board’s CPU support list. On the maker’s support page for your exact model, the list shows which BIOS version each processor needs.You should see: A minimum BIOS version listed against your chip.
- Refit the older processor and update the BIOS. If you still have the chip that worked, put it back, update the BIOS from the maker’s file, then fit the new one. Do not interrupt the power during an update.You should see: The board post normally with the new processor afterwards.
- Or use BIOS Flashback if your board has it. Mid-range and higher boards can update with no processor fitted, using a marked USB port and a button on the back panel. The file usually has to be renamed exactly as the manual says.You should see: A light blink while it writes, then stop when finished. It can take several minutes — leave it alone.
Still stuck? Stop there rather than forcing anything. Use Chat with PC Support or Request a Callback on this page and tell us which of these steps you have already tried — it saves repeating them.
It powers up but cannot find the drive
If you reach the BIOS screen, the board and processor are fine. The drive is either not connected, not seated, or not first in the boot order.
Usually one of these: a loose data or power cable, an M.2 drive not fully seated or in a slot that is disabled, or the boot order pointing at the wrong device.
Try these in order
Before you open the case: shut the PC down, unplug the power cable, hold the power button for about ten seconds to discharge it, then touch a bare metal part of the case to ground yourself. Never open the power supply itself, and never test or probe anything while it is plugged in.
- Look for the drive in the BIOS. Enter the BIOS at start-up and check the storage or boot list. If the drive is not listed, it is a connection problem rather than a Windows one.You should see: Your drive named in the list.
- Check both cables on a SATA drive. A SATA drive needs a slim data cable to the board and a separate power lead from the power supply. Reseat both ends of each.You should see: The drive appear in the BIOS list.
- Reseat an M.2 drive. Undo the retaining screw, remove the drive, refit it at a slight angle until it sits flat, then screw it down. Check the manual — some M.2 slots share lanes and switch off when another slot is used.You should see: The drive appear in the BIOS list.
- Set the boot order. With the drive detected, put it first in the boot priority list and save on exit.You should see: Windows start normally.
Still stuck? Stop there rather than forcing anything. Use Chat with PC Support or Request a Callback on this page and tell us which of these steps you have already tried — it saves repeating them.