It needs to be win7 64-bit, to support 8GB RAM. Use a tool, like www.hwinfo.com to get the parameters of your current RAM sticks. The new sticks should have the same frequency and voltage.
It is win7 64-bit but i think that i read to the manual of the motherbort that it has 4 slots for memory cards 2 whites and 2 blue and it says that only in the same colour slots should have the same memory cards with the same frequency and voltage, is that correct or i'm wrong?
I'm asking only because i dont know and i may have understand different as it says.