Now, I don't know if you've hit any issues yet, but please don't use 4 DIMMs with that motherboard;

I owned one back when they came out, and once I leapt to 4GB ram, it all went to hell. The motherboard wouldn't hot boot, and Gigabyte's Tech Support was.... putting it very kindly... useless. I spent two weeks talking to them, sent it in, and got it back as "works fine".