Problems with new NVMe drive

[Dewam]

Hey there

 

I just bought a new Corsair Force MP510 960 Gb NVMe drive. The read speed is listed well above 3000 MB/s. I have benchmarked it several times with CrystalDiskMark, but I am only getting speeds around 800 MB/s. I am currently running it on a MSI Z97s SLI Krait Edition. In theory, this MB supports PCIe 2.0 for the M.2 drive, which should be enough. I don't know if there is some limitation that I am not aware of, or if I may have configured something incorrectly. Is it perhaps not possible to run it in the normal 2x mode that is listed on the website for my MB (https://www.msi.com/Motherboard/Z97S-SLI-Krait-Edition/Specification)?

 

Before you call me out for buying something that would obviously be bottlenecked by my current system, be aware that I bought this in anticipation of upgrading this fall to a 4th gen Ryzen system (there was a good sale on this SSD).

 

Appreciate it

[Shimejii]

But do you actually need an NVME Drive? Most people STILL dont need one, as they dont offer much unless you are actually using a program that can utilize it.

 

Make sure your BIOS is properly set up to run it in the proper mode.

[BobVonBob]

Two lane PCIe Gen 2 is about 1 GB/s. You're hitting that limit.

[Electronics Wizardy]

2 minutes ago, Dewam said:

MSI Z97s SLI Krait Edition. In theory, this MB supports PCIe 2.0 for the M.2 drive, which should be enough.

THats your problem. That speed you got is about the max those board can handle. THe drives are made for pcie gen 3 x4, or about 4gB/s

 

Your system supports pcie gen 2 x2, or about 1gB/s, and those speeds seem right.

 

 

[RadiatingLight]

Each lane of gen 3 is 1GB/s (Roughly)

Each lane of gen 2 is 500Mb/s (Roughly)

2 lanes of 500MB/s means a theoretical maximum speed of 1GB/s -- Getting 80% of your theoretical speed isn't bad at all.

[Dewam]

1 minute ago, BobVonBob said:

Two lane PCIe Gen 2 is about 1 GB/s. You're hitting that limit.

I was under the impression it was 1 GibeBYTE and not 1 GigaBIT?

[Electronics Wizardy]

Just now, Dewam said:

I was under the impression it was 1 GibeBYTE and not 1 GigaBIT?

It is one gigabyte per second on a pcie gen 2 x2 link, so those speeds are right. Your read speeds are just a bit under one gigabyte per sec

[Dewam]

3 minutes ago, Electronics Wizardy said:

It is one gigabyte per second on a pcie gen 2 x2 link, so those speeds are right. Your read speeds are just a bit under one gigabyte per sec

I read some more, so it seems like you guys are correct. PCIe 2.0 2x is limited to 1000 Megabit/s, and I am hitting the correct speeds.

 

However, I can't help but correct that you are using the term Gigabyte in place of Gigabit. My speeds are a bit under under 1 Gigabit/s, not 1 Gigabyte/s. My speeds translate to only 10% of 1 Gb/s.

[BobVonBob]

1 hour ago, Dewam said:

I read some more, so it seems like you guys are correct. PCIe 2.0 2x is limited to 1000 Megabit/s, and I am hitting the correct speeds.

 

However, I can't help but correct that you are using the term Gigabyte in place of Gigabit. My speeds are a bit under under 1 Gigabit/s, not 1 Gigabyte/s. My speeds translate to only 10% of 1 Gb/s.

You're the one with the wrong units.

 

PCIe 2.0 x2 is 1000 megabytes/s.

 

Your test is 0.8 gigabytes/s. (Gibibytes technically, but gibibytes are dumb. Point is everything is in bytes.)