a8n overclocks decently, currrently on 2.3 with a 3000+(1.8stock) .
I think the fact that dfi overclocks so insanely is what has everyone drooling. If u take the dfi out of the equation, i think the asus stacks very well to every other sli board out there.
as for dual rails, everyone on this board thinks its the most evil thing since rdram, and i was firmly against getting one. When that bfg deal came up with the bundled psu, i thought i was all set. 2 cards and a beefy ps, dont need to worry about a thing. When it came in, realized it was dual rails. Yeah i know, shoulda looked it up before i ordered, but i figured it was the mfg selling dual sli cards, why in the world would they put something in the "bundle" thats not compatible. I nearly cried when i saw the specs on the side, dual 12v rails at 18amps. The ps requirements in the asus manual are very clear, but fwiw on nvidia's site, they do mention dual rail psus as being viable. Im sure their comments about adding amps is wrong, but fortunately for me, my dual rail has been working like a champ so far, been running lots of games on sli with no problems whatsoever. (Prime was run for over 12hrs)
So for the record, i dont recommend dual rail psus.
I do think some of those issues posted are with defective a8n boards. One poster said he couldnt save anything to the bios, no way that could be a psu problem.
Since this has to be the most popular sli board by far, im not that suprpised a few are doa. Still, i think this asus board is solid.
BTW, you are getting a great deal from monarch, i went there recently to build a system for a friend who lives on the other coast, and for larks i built a sli system identical to what i built from parts. The monarch price was dead on what i paid!!! Usually when i build from parts i know im getting it much cheaper but this really suprpised me.
If anyone is building an sli rig, i highly recommend going to monarch and getting everything there, prices on sli mobo and dual 6800gts are cheaper than what you would find building piece by piece.