40w Max for the 8500GT
15w Max for HDD
15w Max for CDROM
30w for Mobo
50w for Case Fans
Total 245w - And that is with everything maxed.
Normal load will be much lower.
So, you are really not concerned about total wattage.
Just look for a good quality PSU.
Here are two good examples.
The first one is just fine for your setup.
The second one would be better if you ever wanted a top of the line video card.
it depends on how good the psu is.
ur system will probably never use more than 300W from the psu. a very good 350W unit(like somethin from PC Power & Cooling) will work fine, but psu's effeciency usually drop as temp rises. check this outhttp://www.silentpcreview.com/forums/viewtopic.php?t=9733
i recommend a good 450W psu, 500W or more if u plan on overclocking or sli or watever. its never a bad idea to get more just to be safe.
Often you can find them on sale cheaper. I agree though, at that price get the Silencer® 610 EPS12V Power Supply. It is $119.00 factory direct, has a 49A 12V single rail and doesn't use modular cables.
If the Corsair 520 HX is to expensive, you could go for the Corsair 450 VX. It a pretty good PS in that range and should meet you requirements. The only thing is, it's not modular contrary to the 520.(that's one of the reason it's a bit more expensive)
I think the Corsair 520W is probably overkill for that setup, unless there are plans for a video card upgrade in the future. I have gamed on my Corsair 450VX with an e6550 overclocked to 3.5ghz and an 8800gt for several hours without problems. My 8600gts obviously runs fine as well. That 8500gt draws next to nothing. I recommend the 450W.
According to intel Q6700 and Q6600 use 95Watts. But B-step Q6600's uses 105Watts.
You cant go wrong with buying a decent 600-700W+ PSU...
Dude it's an 8500GT, you can run it on treadmill power. And TDP is worst case scenario power usage, or rather, not-ever-going-to-happen power usage. According to JKFlipFlop they calculate the max power output by powering-on every single transistor on the die, which just isn't going to happen under any normal conditions. You can try, but your efforts will reward you with an epic fail.