According to CoolerMaster:
http://www.coolermaster.outervision.com/PSUEngine(1 C2D E7200, 1 Radeon HD 6670, 2 Sticks DDR3, 1 5400RPM HD, 1 DVD+/-RW Burner), the absolute max I would ever need is 250W.
http://www.tomshardware.com/reviews/radeon-hd-6570-radeon-hd-6670-turks,2925-15.htmlTheir test setup for a
HD 6670, GT 240, HD 6570, HD 5670, HD 5770 and
GTS 450 never even passed 200Wunder full load. I do mean the entire computer. A GTS 450 rig requiring less than 300W on FULL BLAST just boggles my mind. Wasn't even with a Celeron or Pentium, too, it was with a i5-2500K, Asus P8P67-PRO, 2x2GB OCZ PC3-16000, 750GB WD Caviar Black 7200RPM. I can understand the HD 6670 consuming much less power than quoted; it seems to have been designed for HTPC purposes, but the GTS...
Same goes for the Geeks3D benchmark:
http://www.geeks3d.com/20110516/tested-asus-radeon-hd-6670-review/6/http://www.geeks3d.com/20110516/tested-asus-radeon-hd-6670-review/3/With a non SandyBridge i7-920, 4 GB DDR3 Corsair Dominator, Gigabyte X58-A UD5, Asus HD 6670, Furmark at 1920x1080, the entire rig's power consumption was 194W.