Asus X870E Strix - Chipset vs CPU NVME controller

[Davids777]

Hello, I have an Asus X870E Strix motherboard and a Samsung 990 Pro 2TB NVME. When I put it in the slots controlled by the chipset, I get a very bad write result (Q32T16) -> 963 vs 5696. Is this normal ? Thanks

[Moriendor]

I'm getting 6652.91MB/s (read) and 6476.77MB/s (write) on my chipset connected 990 Pro/4TB in the same test (BIOS version 1003).

Your chipset connected C drive is pretty full at 83% and SSD performance is known to be degrading, the fuller the drive. I'm not sure if 83% is full enough to cause such a poor write result but I would advise to free up some space (as close as possible to the same 54% as your other drive) and run the test again. CrystalDiskMark needs actual data to read/write for the test and with your drive already at 83% capacity, it could be that CDM is simply running out of space during the testing.

[Davids777]

Hi, thanks for the response. Can you do a test with CrystalDiskMark and post the image ? For the moment, I can't make space on my C to check, but I find the difference quite big all the same. 4TB have probably better perfs than my 2TB 

[Moriendor · Accepted solution]

^ Here is my results. Both are Samsung 990 Pro 4TB drives. The C drive is connected to the CPU in M2_1 and the D drive is connected to the chipset in M2_4.

[Davids777]

Thanks, it reassures me to know that it does not come from the chipset controller. I am looking for another NVME to replace one of my SSDs which only has 1TB of capacity. I hesitate between a NVME GEN5 and a GEN4, and the heating of the 990 Pro makes me hesitate to take a second one of this model

Made a new test today, and I get this (I don't know why but problem looks resolved)