Thanks to all for the answers!

Finally I bought another 2 SSDs and made a four drives raid 0.

The problem comes with ATTO Disk Benchmark:




As you can see, performance falls near to 0 in big files. Problem persists using the drivers recommended by Oliverda:



I don't know if its a problem given by the program, or a real performance problem. I tryed 1 gb total lenght and i obtain a more than 100000 result, but problem remains. żdoes it mean that is not a program problem but a real one?



The only way to avoid this problem is disabling NQC.


The results on the other tests are amazing:





But as you can suppose, I don't know if I should disable NQC, and then I get this (obviously worse result, and much worse on "AS SSD" and "CrystalDiskMark":





Or ignoring ATTO and leaving NQC Enabled....