Hi
I too have a Revodrive from OCZ that I use as a boot drive. Mine is the Revo2 though so slightly different to yours but I suspect still much the same. I first used it on an GA-X58A-UD7 motherboard and could only get it to work properly in the X8 slot at the bottom which actually worked out better for me anyway.
I have tried it in the G1.Sniper M3 too and it seemed to work fine but I didn't leave it in there. I would sugest using the top PCIEx16 slot if you are not using a discrete graphics card, if not try the bottom x8 slot instead.