|By the way, I am presently re-loading a friend's system that has a 600 watt Coolermaster PS he bought about two years ago and have found it's single 120mm fan is not working.|
I looked up the model on the web and found this model is known to have fan problems, it has only a one year warranty (found that on the web, not on the Coolermaster web site), and the fan has cheap sleeve bearings on both sides.
Extreme Power RP-600-PCAR
The fan jerks back and forth rather than spinning, so it's probably it's temp controlled speed control that has failed, but fans with sleeve bearings on both sides last the shortest amount of time.
I have attached a case fan to the outlet of it to pull air through it until I get a 120mm case fan installed in it, and now it gets warm rather than HOT..
The fan was working fine a few months ago when I was removing malware from his system.
450 Watt or greater power supply with one 75W 6-pin PCI Express® power connectors recommended (600 Watt and two 6-pin connectors for ATI CrossFireX™ technology in dual mode)
Also from the AMD web site
500 Watt or greater power supply recommended
500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for AMD CrossFireX™ technology in dual mode)
Certified power supplies are recommended. Refer to http://ati.amd.com/certifiedPSU for a list of Certified products
The listed PSs have lists of video chipsets they can be used with but they don't necessarily have 5770 or 6850 or 6870 listed.
However you can look up the min recommended wattage for whatever they list by going here:
Look up the model and search for watt - it's either on the first page or at a System Requirements page link on that page .
E.g. I looked at some Coolermaster models and they list 4850 and 4870
4870 - 500 watts and two power connectors
4850 - 450 watts and two power connectors