990 pro slow random write speeds

[Reminald]

**Could the answer be that my OS is installed on the 990 and the 980 is empty?

Hello. My 990 Pro's random write speed is %50 lower than my 980. Samsung Magician shows them both at PCIe 4x4. I ran the benchmark at Standard and Full performance mode and there were no changes. Thanks for your help.

990 installed in M2_2 slot

980 installed in M.2_5 slot

ASUS Strix 790e WIFI Mobo

MSI MAG A850GL PCIE5 PSU

[3Fees]

All mobos come with chipset lanes and cpu lanes, once these diminish slower speeds on leftover lanes is typical. Try switching the nvme drives. Firmware out of date can cause slowdowns. Can you use a thunderbolt enclosure connected to thunderbolt jack?
Bios out of date can be a issue as well and of course your power brick powering the mobo and the mobo itself. Full power everywhere on the mobo requires a big power brick and the mobo itself can be very expensive.

Cheers
3Fees

[Reminald]

I appreciate the reply. Everything is updated, my PSU is more than sufficient, and this motherboard has enough lanes. I removed the 980 and put the 990 in its place and the random write speed is still 50% lower. Could the answer be that my OS is installed on the 990 and the 980 is empty?

ASUS Strix 790e

MSI MAG A850GL PCIE5

[ddaniel51]

This is one of the 4 990 Pro's in my Asus W790 work station.  All are about half full and have similar performance.

PCIE Gen 4 x 4.