MSI B650M Gaming Plus WIFI Upgrade Guide: RAM, SSD and CPU

Lifecycle and support

No longer sold new. The manufacturer hasn't published an end-of-support date.

Dates not listed haven't been published by the manufacturer or a reliable third party.

RAM: four DDR5 slots, up to 256 GB

The board has four full-size DDR5 DIMM slots and supports up to 256 GB total, which means 64 GB per slot. DDR4 does not fit — AM5 boards only take DDR5. You need standard non-ECC, unbuffered desktop UDIMMs; registered or ECC memory is not supported by this board, even if your CPU can handle ECC in theory.

Memory speed is where expectations need tempering. The headline 7200+ MT/s is a best case: one stick per channel, single-rank modules, and a Ryzen 7000 or 9000 chip with a good memory controller. Fill all four slots or use dual-rank sticks and you should expect around 5400 to 6000 MT/s instead. Ryzen 8000G APUs officially top out lower still. For most builders, a two-stick kit at 6000-6400 MT/s with an AMD EXPO profile is the sweet spot; XMP kits usually work too, since EXPO is simply the native profile for this platform.

If you only buy two sticks, install them in the A2 and B2 slots first (the second and fourth slots from the CPU) — that's how this board runs dual-channel at its best.

Buying tip: check MSI's memory QVL for the exact kit you're considering, and don't pay for 7200 MT/s unless you're running two single-rank sticks on a Ryzen 7000/9000 CPU. If you want the full 256 GB, be aware it takes four 64 GB sticks and will run at the slower 5400+ MT/s tier.

Buying tips

• DDR5 UDIMM only — desktop sticks, non-ECC, unbuffered
• Two sticks: slots A2 + B2. Four sticks: expect 5400-6000 MT/s rather than the headline speed
• 256 GB needs four 64 GB modules; a 2x 16/24/32 GB EXPO kit at 6000-6400 MT/s suits most users

Storage: two M.2 NVMe slots and four SATA ports

There are six storage connections in total: two M.2 slots and four SATA 6 Gb/s ports. Both M.2 slots are PCIe 4.0 x4 NVMe (Key M) and accept only 2260 or 2280 length drives — no 2230, no 22110, and no SATA-protocol M.2 drives. Both are fed from CPU lanes, and there is no published per-slot capacity limit, so any current retail NVMe SSD should work.

One caveat for APU owners: with a Ryzen 8500 or 8300 processor, the second M.2 slot (M2_2) drops from PCIe 4.0 x4 to PCIe 4.0 x2, halving its top speed. The main slot stays at full speed.

The four SATA ports (from the B650 chipset) handle 2.5-inch SSDs and 3.5-inch hard drives, with SATA RAID 0/1/10 available and NVMe RAID 0/1 for the M.2 drives. Whether those drives physically fit is up to your case — the motherboard only provides the ports, so check your case's bay count and drive thickness limits.

One physical note from the manual: long graphics cards and thick M.2 heatsinks can crowd the M.2 area, and since the board only takes 2260/2280 drives, a bulky SSD heatsink plus a big GPU can be a tight squeeze. Check clearance before you buy a heavily heatsinked drive.

Buying tip: for a boot drive, any mainstream PCIe 4.0 NVMe SSD in 2280 size is the easy choice. Use the second M.2 for extra games or work files, and keep SATA for bulk storage.

Buying tips

• M.2 drives must be 2260 or 2280 NVMe — 2230 and 22110 will not fit
• SATA M.2 drives are not supported; use the four SATA ports for SATA drives
• Check case bay space for 2.5-inch/3.5-inch drives and clearance for M.2 heatsinks

CPU: Socket AM5, Ryzen 7000/8000G/9000

The processor sits in a socketed AMD AM5 socket (LGA1718) and is user-replaceable. It supports Ryzen 7000, Ryzen 8000G and Ryzen 9000 series desktop CPUs. Check MSI's CPU support list for the exact model you want, along with the BIOS version it requires.

If you're buying a Ryzen 9000 chip, watch for BIOS support: boards shipped before these CPUs existed may need a BIOS update first. Look for 'Ryzen 9000 Ready' branding on the box, or update the BIOS with an older supported CPU before swapping.

MSI doesn't publish a hard wattage limit for this board. The platform handles 170 W-class parts, but verify your specific CPU on MSI's support list. The BIOS also offers useful power and thermal options: a 65 W ECO mode, custom Config TDP profiles, and PBO thermal profiles capping CPU temperature at 85, 75 or 65 degrees — handy if you want a cooler, quieter system.

Be aware of a real trade-off with Ryzen 8000-series APUs: they cut the PCIe x16 graphics slot to x8 or x4 speeds (x8 with Ryzen 8700/8600/8400, x4 with Ryzen 8500/8300) and slow the second M.2 slot to PCIe 4.0 x2. If you plan to add a dedicated graphics card and fast storage, a Ryzen 7000 or 9000 chip keeps everything at full speed.

Buying tip: match the CPU to your cooling and power supply, and confirm it on MSI's support list before ordering. A BIOS update beforehand is cheap insurance for newer chips.

Buying tips

• AM5 only: Ryzen 7000, 8000G and 9000 desktop processors
• Confirm the exact CPU and required BIOS version on MSI's support list
• Avoid 8000G APUs if you want full-speed graphics and M.2 performance

How to upgrade

Before you start

• Back up anything important before you change hardware.
• Shut down the PC, switch off the power supply and unplug the power cable.
• Ground yourself — touch the bare metal case or use an anti-static strap — before handling parts.
• Open the case and install the component. For RAM, open the slot latches, align the notch and press the module firmly until the latches click shut. For M.2 SSDs, the manual describes the mounting screw for the 2260/2280 positions. For a CPU, follow the socket's installation frame and lever exactly as MSI's manual shows. Check the owner's manual for your exact case and board revision before opening anything up.
• Close the case, reconnect power and boot into the BIOS to confirm the new part is detected — check the memory total and speed, the storage list and the CPU model.
• Install or update your operating system's drivers afterwards where relevant.

Steps

1. Back up your data
   Save anything you can't afford to lose before touching the hardware.
2. Power down and unplug
   Shut the system down fully, flip the power supply switch and unplug the cable from the wall.
3. Ground yourself
   Touch bare metal on the case or wear an anti-static strap so static doesn't damage the parts.
4. Open the case and install
   Fit the RAM, SSD or CPU as described above. The exact latches, screws and frames vary by component, so have MSI's manual open for the board details and your case manual for disassembly.
5. Close up and check the BIOS
   Reassemble, boot, and confirm in the BIOS that the new memory, drive or CPU is recognised at the expected capacity and speed. A BIOS update may be needed before a new CPU works.

Good to know

• Memory speed depends on your CPU and module layout: 7200+ MT/s is a best case (one stick per channel, single-rank, Ryzen 7000/9000). With four sticks or dual-rank modules, expect 5400-6000 MT/s.
• Third-party manual mirrors list 128 GB maximum memory; MSI's own spec sheet and manual say 256 GB. We follow the manufacturer's figure.
• There is a GIGABYTE board with the same name but different storage layout, memory support and rear I/O — check which board you own before ordering parts.
• Drive bay fit and thickness limits for 2.5-inch and 3.5-inch drives depend on your case, not the motherboard.
• MSI does not publish a hard CPU wattage limit for this board; verify your exact processor on MSI's support list.

Frequently asked questions

How much RAM can the MSI B650M Gaming Plus WIFI take?

Up to 256 GB total, using four 64 GB DDR5 UDIMMs. MSI's spec sheet and manual state 256 GB. Some third-party manual mirrors list 128 GB, but the manufacturer's own documentation is the more reliable source. Expect the full 256 GB to run at around 5400 MT/s rather than the headline speed.

Does it support DDR4 or ECC memory?

No to both. The board takes DDR5 only (an AM5 limitation) and requires non-ECC, unbuffered desktop UDIMMs. ECC is not supported by the board, even with CPUs that can handle ECC elsewhere.

What size SSDs fit the M.2 slots?

2260 and 2280 NVMe drives only. There is no support for 2230 or 22110 drives, and the slots are NVMe/PCIe only — SATA-protocol M.2 drives won't work. Use the four SATA ports for SATA SSDs and hard drives.

Which CPUs does the MSI B650M Gaming Plus WIFI support?

AMD Ryzen 7000, 8000G and 9000 series desktop processors on Socket AM5 (LGA1718). Check MSI's CPU support list for the specific model and BIOS version it needs. Boards built before Ryzen 9000 may require a BIOS update first.

Do Ryzen 8000G APUs slow anything down?

Yes. With Ryzen 8700/8600/8400 APUs the PCIe x16 slot runs at x8; with Ryzen 8500/8300 it runs at x4, and the second M.2 slot drops to PCIe 4.0 x2. That's a real limit for a future graphics card or fast second SSD.

Do I need a BIOS update to upgrade?

Possibly. Ryzen 9000 CPUs may need a BIOS update on older stock, so check the 'Ryzen 9000 Ready' branding or update the BIOS before installing the new chip. Memory and storage normally work without a specific update, though keeping the BIOS current is always sensible.

Official documents and references

• MSI B650M GAMING PLUS WIFI — official specification page
  Authoritative specs: memory support, storage layout, expansion slots.
• PDF MSI B650M GAMING PLUS WIFI — official manual (PDF)
  Installation details for RAM, M.2 drives and CPU, plus RAID information.
• PDF MSI B650M GAMING PLUS WIFI — official manual (PDF, mirror)
  Same manual, alternate download location.
• MSI B650M GAMING PLUS WIFI — product page
  Overview, feature list and links to support resources.