In a new PC I had constantly BSoD. I tracked it down to bad memory modules and took them back to the shop.
Specifically the RAM was Corsair.
Anyway they said they will do test on memory to confirm.
They did tests and admitted the RAM was faulty and gave me a replacement.
At this point: originally I bought 2 kits of 4G RAM. One of the kits turned out bad.
They gave me a replacement, it does not seem to be exactly the same, though.
In any case, I became causious and as soon as I got them I put them in the PC and run KUbuntu memtest.
It started showing thousands of errors! (Again!).
I removed the new kit and run the test again. No errors.
I swapped the slots I put the memory modules and also no errors.
I can not understand now. Is the new RAM kit bad or not? Does the slots I place the kits matter?