I bought an AMD X2 4400+ with an ASUS A8N-SLI Premium. If anyone solved the problem they please tell me. I think that the second core isn't recognised by the BIOS. I tried i BIOS update with my ASUS software but it didn't work. Now I'll use a floppy to check it out. If anyone has any other suggestion on the same CPU and MOBO then please help me!