leipp124c02a1
New member
- Joined
- May 11, 2025
- Messages
- 22
tl;dr;
Devices in both M2_1 and M2_2 ports show connecting at 5.0x4.
Each device only reaches 4.7GB/s which is not even gen 4.0x4 max speed of 7GB/s.
I'd expect closer to 14GB/s.
details:
BIOS: latest A44
linux kernel: tried various 6.12.n and also the latest 6.14.6
2x Crucial T705 gen5 NVMe in M2_1 and M2_2 ports.
lspci -vv shows both connected at gen 5.0x4, 32GT/s link speeds.
Testing with dd if=/dev/nvme0n1 of=/dev/null bs=4096 count=10M shows a mere 4.7GB/s on either device.
Testing with hdparm -tT [--direct] /dev/nvme0n1 shows similar slow speeds.
I checked the temps before, during, and after each test run and they never exceeded the 40C range (I think 44C was the highest temp I saw).
They should see close to 14GB/s.
Meanwhile on my older board my older gen 4.0x4 NVMe sees 7GB/s as expected, connected at 4.0x4 16GT/s link speed.
I've tried disabling M2_2, it had no effect on M2_1.
Setting either or both to gen4 speeds they show correctly as 16GT/s link speed and still show only 4.7GB/s performance.
I tried disabling the PCI ASPM, no change.
Not sure what else to try.
Devices in both M2_1 and M2_2 ports show connecting at 5.0x4.
Each device only reaches 4.7GB/s which is not even gen 4.0x4 max speed of 7GB/s.
I'd expect closer to 14GB/s.
details:
BIOS: latest A44
linux kernel: tried various 6.12.n and also the latest 6.14.6
2x Crucial T705 gen5 NVMe in M2_1 and M2_2 ports.
lspci -vv shows both connected at gen 5.0x4, 32GT/s link speeds.
Testing with dd if=/dev/nvme0n1 of=/dev/null bs=4096 count=10M shows a mere 4.7GB/s on either device.
Testing with hdparm -tT [--direct] /dev/nvme0n1 shows similar slow speeds.
I checked the temps before, during, and after each test run and they never exceeded the 40C range (I think 44C was the highest temp I saw).
They should see close to 14GB/s.
Meanwhile on my older board my older gen 4.0x4 NVMe sees 7GB/s as expected, connected at 4.0x4 16GT/s link speed.
I've tried disabling M2_2, it had no effect on M2_1.
Setting either or both to gen4 speeds they show correctly as 16GT/s link speed and still show only 4.7GB/s performance.
I tried disabling the PCI ASPM, no change.
Not sure what else to try.