What RAM works with the ASRock B550M Pro4?
DDR4 only. DDR5 sticks won't fit.
- Slots
- 4 (DDR4)
- Max capacity
- 128 GB
- Slots to use
- A2 and B2
- Overclock
- up to 4533 MT/s
Memory speed
- This board. Rated 4533+ MT/s with Ryzen 3000 and 5000 CPUs; the 4733+ figure applies only to Ryzen 4000G and 5000G APUs.
- Memory controller. Above about 3600 MT/s the memory fabric usually drops to half speed.
- XMP and EXPO. Up to 3200 MT/s is guaranteed by the CPU. Anything up to 4533 MT/s is an overclock most CPUs handle.
- Two sticks. Use A2 and B2, the second and fourth slots from the CPU, for dual-channel mode.
Good picks for this board
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- G.Skill Ripjaws V DDR4-3600 CL16At the 3600 MT/s sweet spot, CL16 timings.Search on Amazon
- Corsair Vengeance LPX DDR4-3600 CL18At the 3600 MT/s sweet spot, CL18 timings.Search on Amazon
- Corsair Vengeance LPX DDR4-3200 CL16Runs at 3200 MT/s, CL16 timings.Search on Amazon
RAM kits we've checked
Verdicts assume a Ryzen 5000 CPU. Check with your CPU
| Kit | Speed | Profile | Verdict | Details |
|---|---|---|---|---|
| G.Skill Ripjaws VF4-3600C16D-32GVKC | DDR4-3600 CL16 | XMP | Compatible3600 MT/s | Details |
| Corsair Vengeance LPXCMK32GX4M2D3600C18 | DDR4-3600 CL18 | XMP | Compatible3600 MT/s | Details |
| Corsair Vengeance LPXCMK16GX4M2B3200C16 | DDR4-3200 CL16 | XMP | Compatible3200 MT/s | Details |
| Kingston FURY BeastKF432C16BBK2/32 | DDR4-3200 CL16 | XMP | Compatible3200 MT/s | Details |
Questions
Does the ASRock B550M Pro4 support DDR5?
No. It only takes DDR4. DDR5 sticks have the notch in a different place and won't fit.
What RAM should I buy for the ASRock B550M Pro4?
From the kits we've checked, the G.Skill Ripjaws V DDR4-3600 CL16 (2x16 GB) is the best match. At the 3600 MT/s sweet spot, CL16 timings. A good alternative is the Corsair Vengeance LPX DDR4-3600 CL18. On Ryzen 5000, around 3600 MT/s gives the best value; faster kits are rarely quicker in practice. Buy the capacity you want as one two-stick kit rather than mixing kits.
What is the fastest RAM the ASRock B550M Pro4 supports?
ASRock rates it up to 4533 MT/s with overclocking. Ryzen 5000 officially supports 3200 MT/s, and around 3600 MT/s is the practical sweet spot.
How much RAM can the ASRock B550M Pro4 take?
Up to 128 GB across 4 slots.
Which slots should I use for two sticks on the ASRock B550M Pro4?
A2 and B2, the second and fourth slots counting from the CPU.
Specs checked 2026-10-13 against the manufacturer's page. Source. Report a correction