Just thought I'd post an update on here. I ended up selling my 3 660tis for 460 dollars. (I'm in Waterloo, ON) And I picked up a MSI 780ti reference card. I've got it overclocked to 1269 GPU clock, and 7590 mem clock. I can't hit my previous scores with my 3 cards believe it or not. I thought this one would easily beat them out. Though these are just benchmark runs, not necessarily pure gaming performance
3 Cards - 3dmark ultra score 3138 - Unigine Valley Score (Extreme HD Preset) 3744
780ti - 3dmark 3003 and valley 3309
3 Cards - 3dmark ultra score 3138 - Unigine Valley Score (Extreme HD Preset) 3744
780ti - 3dmark 3003 and valley 3309