I've got two kits of 4GB each of F3-12800CL7D both kits run 1.6v 7-7-7-24 1T without a problem. They have been used exclusively in a P55 board but recently moved to a P67 board without a problem. The first kit I bought was $149 and the tag says 1600mhz 7-7-7-24 1.6v. The second kit while being identical G.Skill changed the tag to read 1600mhz 7-7-7-24 1.65v however I've run all 8GB in the same board at 1.60v (1600mhz) and ran extensive memtest, prime and LinX without an issue. These kits will also run 1600mhz 8-8-8-24 1T @ 1.53v if need be. Other that lowering the voltage and loosening the timings these kits have never been overclocked but from reviews I had seen they will go higher than they are rated for. I am looking to get $75 per kit or $140 for both (shipped). Please no low ball offers. Prices shown are shipped USPS. Heatware 113-0. No trades.