I have a Gigabyte P35-DS3L motherboard and have been running 4 gigs (4 x 1GB Corsair TWIN2X2048-6400C4; 4-4-4-12; 2.1 volts) on it with no problems. Windows 7 runs great.
I decided to up the ante to 8 gigs RAM (4 x 2GB Corsair TWIN2X4096-6400C5; 5-5-5-18; 1.8 volts -- which is approved from...