I think the Processor are fine, but PSU are not.
mpilchfamily said on 8800GTX power requirements thread :
What you need is a new PSU. The 8800's pull about 15A on there own. They pull 6 of those amps through the PCI-e slot and get just under 5A from each of the 2 PCI-e power connectors. Most systems not including a video card will draw about 15A. So your PSU needs to provide no less then 30A in total on the +12v rails. Now some highe quality 450W PSU will handle this but i recomend a good 500W or better PSU. SLIed 8800s need about 52A on the +12v rails. Now if you plan to or already do some OCing you will want to have a godd buffer of 4A or more on the +12v rails.
Credit goes to mpilchfamily. Thanks to mpilchfamily.