M.2_2 Slow

[Mazeballz]

Just tested my Samsung 960 Pro for the first time despite owning it for a couple years. 

 

It's plugged into the bottom M.2 slot. I've ensured the m.2_2 slot is set to x4. It's running at around 2600write and 1900read when it should be 3500write and 2100read. Why?

[Radium_Angel]

2 minutes ago, Mazeballz said:

Why

Maybe your mobo is an older PCIe gen and it's being maxed out?

We have no way of knowing since you didn't list any specs

[minibois]

Those write speeds do suspiciously look like PCIE 2.0 x4 speeds.

The read speeds exceed the 2GB/s max of that interface though.

 

But indeed, some more specs would be helpful in helping you... Keeping in mind the specs listed on the website are usually 'best case scenario' results.

[Mazeballz]

oh haha, sorry. z370 asus maximus hero x

Just one GPU, 1080ti

8700k if that matters

[Mira Yurizaki]

Testing the OS drive may also be affected by the fact it's the OS drive and the OS and applications still need to run and grab data from it.

[Mazeballz]

2 minutes ago, Mira Yurizaki said:

Testing the OS drive may also be affected by the fact it's the OS drive and the OS and applications still need to run and grab data from it.

It is indeed the OS drive. Is that a guess or is that actually a thing?

[Radium_Angel]

2 minutes ago, Mazeballz said:

actually a thing?

It's a real world problem

[Mira Yurizaki]

2 minutes ago, Mazeballz said:

It is indeed the OS drive. Is that a guess or is that actually a thing?

It's a factor that could affect testing. If you wanted to ensure you're getting accurate results, you can't test the OS drive because the OS may be doing things that cause storage drive activity.

[Mazeballz]

Been looking this up for an hour and have seen nothing referencing that until now. Interesting.

[Mazeballz]

And this just happened. So it looks like you're right. Must have been in use when I was previously testing it

[Mira Yurizaki]

I should also point out the advertised speed is likely:

• Under ideal conditions
• With a blank drive
• With a certain test that none of us know what they did to get the numbers.

For example, in AnandTech's review of the 2TB 960 Pro, they listed the Sequential Read speed as 3,500 MB/sec. However, in their sequential read tests, they never got that number:

 

 

So basically, take the read performance with a grain of salt. SSDs in consumer use cases are more about their IOPS.