Anyhow, I finally got my 250mm fan mod done so I can cool them gtx 580's properly. Have the 2 corsair white led 200mm fans, and the side white led 250mm fan all hooked into the onboard fan controller and very quiet indeed and massive airflow when dialled up. My gpu's were idling at 38 and 33. They now idle at 33 and 30. And I've run Heaven a few times with the fan up and I have not seen them them go over 72. This is at 900mhz core and using the default auto fan profile (i only use this for benching, 830 for gaming, and stock for day to day). Previously I was hitting 86+. A side effect of this sidefan is the southbridge is running about 10 degrees cooler and the front fan I have rigged to blow air into the case depending on sb temps now stays around 900rpm. Before it would get up to 1400rpm. H70 is still push/pull as an intake so may reverse that so it outtakes now. After that, will do some proper benchmarks. 3 way SLI was a bust. GPU's went mad and stayed at around 60% fan speed all the time. Noise when gaming was unbearable.