Pc won’t boot out of BIOS when XMP enabled

Akayy · April 5

Hi there,

I have recently built a brand new gaming pc from scratch

cpu: Ryzen 7 7800x3d

gpu: nvidia GeForce gtx 3080

ram: Corsair vengeance ddr5 32gb - 7200 mhz CMH32GX5M2X7200C34

mobo: Gigabyte B650 AORUS ELITE AX ATX Motherboard

When I first booted up the pc I made sure to go into the bios and enable XMP to ensure my RAM is running at full speed however once I did this the PC would only load into the BIOS no matter what. I tried to manually tune the RAM in both clock speeds and voltage and when I reduced the clock speed to around 6000mhz the pc was working. After a few days however I kept getting BSOD and I figured out that if I changed the RAM back to default it stopped the BSOD from occurring so I’ve been running at the base 4800 since even though I paid extra for the higher clock speed.

If anyone has any other suggestions to fix this I’d appreciate it

OU812 · April 5

I think most Ryzen cpus wont run past 6000.

RONOTHAN## · April 5

1 hour ago, Akayy said:

when I reduced the clock speed to around 6000mhz the pc was working.

Then leave it at 6000MT/s, that's better for performance anyway.

For reference, AM5 CPUs have two memory modes: 1:1 and 2:1 mode. 1:1 mode offers much better latency, while 2:1 mode allows for much higher clock speeds. For speeds above 6000MT/s, it will default to 2:1 mode, and because of that massive latency penalty, you don't see a performance uplift until you hit 7600MT/s at the earliest, so 7200 CL34 will just be slower than 6000 CL30. Plus, since you have a single CCD chip with half the FCLK bandwidth, you don't get any of the performance uplifts from the extra clock speeds, so 2:1 mode is pointless from a performance perspective.

If it's still erroring at 6000MT/s, change the BIOS revision as there are some BIOS revisions that can give weird memory issues like you're running into.