m.2 variation on read speed

[Xungo]

Hello guys, I'm new here, so sorry if I don't know any rules.

After a quick search I didn't find a topic which could explain me this but my m.2 SSD have a really constant write speed at ATTO Disk Benchmark but the read speed is a total mess.

Here are two exemples I've made, one after another, and the read speed is so different on the same file size and I have no idea why.

If someone could explain this to me I would appreciate. I don't know if I did something wrong on the instalation but it seems fine!

Oh, it's a Corsair MP500 120GB.

Thx for all the help.

 

[SSD Sean]

That could be from heat and it could be thermally throttling. Or is being accessed at the same time by the os.