Alright well i recently purchased a GTX 295 from Evga and im not really happy with my vantage score. I think my mobo has something to do with it.
My GPU overclocked to 675/1455/1269 gets a score of around 17489
My GPU Stock at 576/1242/999 gets a score of 15734
I have seen people hit 20k with a single 295
My board is not the greatest, its from my old hp from 2008
the rest of my specs are in my sig