If I get the 8800GTS which is stated to require a 26Amp 12v Rail and a PSU has 2 x 20Amp rails, will the G/card draw more from one to compensate or would it be wise to use a double molex to 6 pin PCIe converter so the card can draw half from each rail?

It doesn't work that way, dual rail PSU's almost always use one rail to power the CPU vis the P4/EPS &
the other rail for everything else.

Single +12V rail PSU's are recommended for "monster" GPU's, especially in SLI/CF.

You PSU should be fine with one 8800GTS. :angel:

Thanks bro. So my intended COOLMAX CUG 700w should be ok then?
http://www.newegg.com/product/Product.asp?...N82E16817159058

Why not get this one instead? It's the same price but much more recommended. http://www.newegg.com/Product/Product.aspx...N82E16817341002