I'm running i5 overclocked, SSD, 16GB RAM and GTX970 graphics card. I picked the i5 because it seemed like diminishing returns for the money based on my understanding of the numbers and wondered if I'd have the same experience with SLI. I play Planetside 2, Warframe, Killing Floor, and a few others. Who has tried SLI? Would you recommend it? What worked? What didn't?