PC Power & Cooling seems to believe the more the better so they have just introduced a new PSU that can continuously deliver 1000W with peaks of maximum 1100 watt and juicy 66A 12V lines. These power supplies fit in standard ATX cases and the manufacturer claims they run quietly.
"In order to generate one kilowatt of continuous power from the existing
850 SSI platform, the Turbo-Cool 1KW's power modules were engineered for
greater thermal efficiency and key components throughout the unit were
upgraded to handle the additional current. The result is an EPS12V/SSI/SLI
power supply with unprecedented output (66 amps total on the +12VDC rails)
in a form factor that fits most ATX cases."
Turbo-Cool 1KW PSU Specifications:
1000W Continuous and 1100W Peak
Fits Std. ATX Cases (20” min. depth)
+12VDC Rails Total 66A (70A Peak)
High Efficiency (85%) with .99 PFC
Amazingly Quiet Cooling System
Complete Array of Output Connectors
EPS12V, SLI, and SSI Compatibility
5-Year Warranty; Unbeatable Support
The Turbo-Cool 1000W PSU will ship for a very high price tag, it will retail for $489, but will have a 5-year warranty.
Personally I think this is just overkill. There's no desktop system on the market that even needs anywhere close to 1kW of power and most people have more than enough with a 400W PSU. Even for the future 1000W is still overkill as the overall tendency seems to be to lower the power consumption of computer systems.