Crucial P5 Plus not running at advertised Speed

[Carlix]

I just replaced the SSD in my HP 285 g3 Microtower (Ryzen 5 2400g with a B350 motherboard) because the cheap preinstalled SSD finally died. Because of the large discount, I ended up getting a Crucial P5 Plus 500 gb. Everything is working fine, but it seemed like it wasn't a big improvement from the old SSD, even though it should be much faster on paper. So I did some benchmarking and both CrystalDiskMark and AS SSD show sequential read speeds around 1500 mb/s, even though the SSD is supposed to be capable of more than 6000 mb/s. I checked HWinfo to see if the NVME slot might not be running x4, but it is. Any idea what could be the cause? Did I get a faulty SSD or are those just hardware restrictions due to a shitty proprietary motherboard? Thank you for your help.

[ki8aras]

6 minutes ago, Carlix said:

I just replaced the SSD in my HP 285 g3 Microtower (Ryzen 5 2400g with a B350 motherboard) because the cheap preinstalled SSD finally died. Because of the large discount, I ended up getting a Crucial P5 Plus 500 gb. Everything is working fine, but it seemed like it wasn't a big improvement from the old SSD, even though it should be much faster on paper. So I did some benchmarking and both CrystalDiskMark and AS SSD show sequential read speeds around 1500 mb/s, even though the SSD is supposed to be capable of more than 6000 mb/s. I checked HWinfo to see if the NVME slot might not be running x4, but it is. Any idea what could be the cause? Did I get a faulty SSD or are those just hardware restrictions due to a shitty proprietary motherboard? Thank you for your help.

you will never get 6000 mb/s because your motherboard and cpu do not support pcie 4.0

[PDifolco]

Just now, ki8aras said:

you will never get 6000 mb/s because your motherboard and cpu do not support pcie 4.0

Not even sure it supports PCie3...

Speed looks like Gen2x4 (or Gen3x2...)

 

[rippy4500]

B350 can't do gen 4 which is required for 6000 mb/s, you can do only ~3000 with gen 3 x4. Although maybe you're running gen 2 somehow giving you 1500 mb/s.
Turn off ASPM in the bios if you can, cause it can mess with PCIe gen.
Make sure the drive is in the NVMe slot closest to the cpu if it's not already, maybe that's your issue.

Also I don't think 1500 mb/s is a big bottleneck anyway, latency and iops matter more most of the time.