I think your going to find that the dual 5520 chipset SM board will present it's own issues with latency but I wish you luck with this.
I have this sitting in my living room but damned if I can get it to post with any chips I've tried inc the earliest X5570's( Bios text says it was tested with those chips at the beginning) to X5670's..
Board lights up,fans spin but nothing else..
http://www.supermicro.com/products/s...7046GT-TRF.cfm