I installed this ram: "Corsair 4GB DDR3 1333Mhz SODIMM 204 - CMSO4GX3M1A1333C9."
If I use only one module in any of the memory banks the system works. If I install the modules together the system crashes frequently with many BSOD errors ... what can be the problem?
The ram seems to be compatible: with only one module works well even under strees test.
I am sorry for the issue.
I assume you tested both memory sticks individually. You may also try updating the BIOS.
I recommend checking with the manufacturer if the memory complies with the requirements detailed in the article below. Tested memory models are also listed there.