Hello, i have Hp probook 6570b with i7 3540m, with 4gb ram at 1600mhz. bios and everything is updated. While using 1600mhz ram laptop freezes in linux on normal use, and on windows laptop freezes, sometimes shutdown like powercut off i mean you are browsing something and bam!! laptop off in a second without any warning, and somethings it shows BSOD. i thought it as ram faulty but i tried many memory tests and it was alright, when i put 1333mhz ram it works perfect. why is that so?