I'm thinking of getting this: ASUS GTX660-DC2O-2GD5 GeForce GTX 660 2GB 192-Bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Video Card
However, my mobo is the Asus P6T Deluxe v2, which has a 2.0 slot.
I know 2.0 and 3.0 are compatible, however, when I first built my system about 5 years...