I have a few... all green pcb, all evga.. the best 8800gt by far has to be the akimbo.

When comparing them side by side, the akimbo has better pwm hardware, or at least more of it. the sercret to success.. more stuff on the pcb..
The 4870's should all be software tunable w/ volts.. ati tray tools should let you set the volts to whatever you want.