Right now I am using an antec truepower 650w. The old model. Ever since putting my second BFG 9800gtx+ oc 1gb 65nm card in(i run 2 in sli), I've been getting random lockups. Its probably because the power supply shares 1 19amp rail for everything that isn't the motherboard and cpu. My computers specs are:
Motherboard: Gigabyte ex58-ud5
Processor: Intel i7 920 2.66ghz
video cards: 2x bfg 9800gtx+ oc 1gb 65nm in SLI
Soundcard: Xonar Essence xts
Hard drives: 2 cavier green 500gb
Both of those power supplies are in my price range, and I like that they have a single rail so I don't have to worry about bridging problems, or just overloading 1 rail while having extra power on a separate rail. I know corsair is supposed to be one of the best psu companies and that particular coolermaster has been reviewed decently. In the future, I may buy two gtx 280 card to replace the 9800's. I also would like to do a reasonable overclock on my cpu when I get a better heatsink. Would the corsair be enough for that? If not, then what do you think about the coolermaster? Would it be any good?
I would appreciate any insight or opinions you have.
Id go with the corsair of the two choices. terrific warranty (7yrs) 100,000 mean time between failure, 9/10 @ cpu3d.com, editors choice award @ overclock3d.net, recommended by johnnyguru.com, editors choice at driverheaven.net,... what more could you want?
oh.. you want the SECRET formula.. ok.. shh, dont tell anyone:
PSU needed power equation: ___number of watts of your cpu + ___ number of watts on your graphics card (see below) + 20Watts for each hard drive +7watts for a cd/dvd drive + 3watts for each memory module + 20-60watts for your motherboard. add it up, this is how many watts you NEED.
[your bfg 9800gtx needs 25-30amps on whatever rail is powering it and >350watts, adding a second 9800gtx requires a minimum of 700watts and 45 amps on one rail (or 25-30 amps per rail if connected to separate rails]
[you mentioned wanting to go to two gtx280: they require less power: 17amps and 205watts for one, and ~27amps and 322watts for the second]
ok here's the slightly confusing part. power supplies are made to operate best between 65% and 85% load although a quality psu will usually have no problem operating at right around 100% efficiency continuously...
The general rule of thumb is a high quality 700 to 750 watt power with sufficient current (amps) on the 12 volt rail(s) can easily handle a system with just about any two video cards operating in dual mode.
The Corsair HX850 with a single large 12 volt rail rated at 70 amps is more than sufficient to meet your needs. The brand new Corsair HX750 with a single large 12 volt rail rated at 60 amps, which is also 80+ Silver Certified, would also be sufficient to meet your needs.
rkaye - The secret formula is overestimated and does not reflect the actual total power consumption of a system with an Intel Core i7 920 overclocked to 3.33 Ghz and two 9800GTX+ 65nm cards while playing a game such as World of Warcraft or Call of Duty 4. In addition, the power requirements you stated are for the total system with all components. They are also overestimated because people insist on buying cheap power supplies of questionable quality and value. That's okay though since both Corsair power supplies can easily exceed the overestimated requirements.