The Sniper M5 uses the two furthest away green slots for 8X/8X SLI, leaving a single slot gap in-between dual slot thick cards.
Lovely board, too
The GPU in the lowest slot will hang over the bottom of the motherboard, so make sure your case has room for that.
http://www.google.co.uk/imgres?star...&page=5&tbnh=171&tbnw=180&ndsp=40&tx=80&ty=89
It must work as there are pictures of large gfx cards in the bottom slot.
Similar question in this thread - http://www.overclock.net/t/1274070/gigabyte-g1-sniper-m3
Great .. thanks for that. I just dont know if I'm trying to cram too much into a BitFenix Prodigy M. Wish I'd just gone ATX now..