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USB 3 (by CPU) work as USB 2.0 !!!

lzeppelin
Level 7
Hi everyone,

I have performance problem with red 3.2 usb ports (type A) on the back of the b550-e gaming.
This issue concerns any memory usb device... max 40 MB/s writing and reading

If I connect any ssd or fast usb stick on these ports, the performances are terrible, comparable to an usb 2.0.
AIDA64 confirm USB 2.0 speed !!!

While type C 3.1 gen 2 (always in the back panel) sometimes work @ 3.1 gen 2 and sometimies @ 3.1 gen 1 (it is decided on boot)

While no problem with usb 3.1 gen 1 front USB ports, these always work fine !!!

What may be causing this?

My configuration:

b550-e bios 2423
5950x
rx580
ssd nvme 4.0 on the top m.2 soket
window 11 and last AMD chipset drivers

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