Is there any reason why RAM should pass MemTest but fail under Windows 7 x64?
I have 3x2Gb 1333 sticks in an Asus M5A99X Evo R2.0 with a 1055t CPU.
My last board (MSI 870A-G54) died after 3 hard years of good service which is when I bought the Asus.
Setting the board up identically to the previous MSI OC I was immediately aware of a 5% drop in performance and over a couple of months have been plagued with BSOD, system freezes and CRC errors in WinRAR so I lost confidence in the machine.
Despite thoroughly testing with MemTest and Prime95 I could find no problems, temps included.
However returning the RAM to stock speed instead of 1397 saw the CRC errors in WinRAR disappear.
Other than the RAM getting tired I can only imagine the possibility that under load the PSU/motherboard voltage fluctuate and compromise stability of the RAM.
I'm happy to report everything is rock solid now:
Strangely enough the old MSI board performed better, given that Asus have a 3 year warranty, and that's how long my MSI lasted, I'll be more tempted to buy a budget board next time.
Cheap as chips and last long enough to coincide with upgrade cycle.
Buy cheap, OC it and don't worry about it dying!
BTW that's 3 hard years of the 1055t (125W) running at 3.668Ghz slightly undervolted without problems if anyone's interested.