Okay, so what are you suggesting I do, Jurassic?
I would like to know what good PSUs are there and based on that get the PSU and a graphics card.
So I am not supposed to look at the wattage. What should I look at then when searching for GPUs and PSUs?
Maybe I should change the way I am looking at this. I would like to run a GTX 550 Ti/ TOP. What PSU would be recommended?
Thanks
1. Wattage is important, but amps and components used inside are even more important.
2. CPU clock speed is important, but so is the architecture. A game that tops out at 2GHz using a Core i5 760, doesn't mean it will top out on a Phenom II X4 also at 2GHz. Clock speed is nothing without a good architecture.
So as for what PSU should you get...
First decide on a card that you can afford and runs as many games as possible at a framerate that is to your liking (ie: 40fps average with HIGH to Max detail @ 2xAA and 1680x1050).
As for a PSU, after you decide on the required amps and wattage needed to power your graphics card and ALL your other components, add at least 100 or so extra watts and an extra 10 or so amps for any future upgrades and/or overclocking. If the card you decide on needs 30A and a 450w PSU, buy a PSU that does 40A and 600w. And look for at least a Bronze certified PSU (less heat, more efficient as you move up the certification chart (Bronze, Silver, Gold, Platinum certified PSU's)). In addition to sites like Techspot, I also use newegg for customer reviews on hardware.
I went with the Coolermaster Silent Pro M850w Bronze certified, 66A single 12v, modular PSU, running two (up to) 300w HD 6950's and an overclocked Q6600. CPU's and GPU's will consume the most power in any system. Under load a CPU can use north of 100w, and GPU's can use north of 225w. CPU and GPU reviews will almost always tell you total power consumption near the end of the review. Required amps can be found on the card makers website, and/or use newegg. Read reviews front to back, and don't just look at the graphs until you get comfortable.
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GeForce 550 Ti required amps: 24A
GeForce 550 Ti recommended wattage: 400w (a 400w recommendation refers to the total system power consumption, not just the card)
After finding this info, I would recommend a PSU with at least 34A and 550w. This is where i leave it in your hands. I don't feel comfortable telling people exactly what to buy. Plus it took me over a week to decide on this Coolermaster. Corsair, Coolermaster, are good brands, but not everything they make is good. That's where researching comes into play. Good luck man. Hope this helped.