Summary: I almost returned this board for being DOA, but then I read reviews by people saying it's picky with RAM. They weren't kidding. It wouldn't boot with any of the several 4gb modules I had on hand. Finally I got it working with 2x 4GB GeiL 1600, model GEC316GB1600C9QC (originally sold as a 4x 4gb set). Other than that, no problems so far with an E8400 running at stock speed.
Summary: THIS BOARD IS VERY PICKY WITH MEMORY! I wanted 2x4 gig and there was very little 4 gig modules marked as supported by Gigabyte. After trying about 4 different brands and speeds I went with http://www.amazon.com/gp/product/B00683X4PQ/ Crucial 8GB Kit (4GBx2) DDR3 1600 MT/s (PC3-12800) CL11 Unbuffered UDIMM 240-Pin Desktop Memory Modules CT2CP51264BA160B that works perfectly.