Why did I think your had three 570's? Hmmmmm. Anyway, the Asus is great with a Phsyx card but will take up to 3 slots away. I know you know this. The Lightning as Blackbalt89 suggested is an equivalent quality non-reference card runs just as cool. Like he said you can run it with a Physx card and leave the door open for an SLI later with Physx or Tri SLI if your insane enough or have the juice. LOL.
Oh Baclkbalt89, I think I have my voltage at 1.1 because my max VDDC on GPU-Z is max at 1.076 today as I was monitoring my kids while playing RIFT. So I believe I had flashed it with th BIOS provided by EVGA, hence why I'm getting those higher core clocks. Would I be right in this assumption?
I know I flashed it with the fan unlocker and mine is set as follows with a curved sliding scale as opposed to steps up:
40C - 45%
50C - 56%
60C - 67%
70C - 78%
80C - 89%
90C - 100%
I have it working harder as the temp climbs by 1% each 10C.