PP Mguire
Build Guru
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Wrong, video card makers mark a PSU limit as the minimum you need to run that card and a relative machine. Go to Nvidia's website and every single one of their cards says "Minimum PSU requirements ***w".When it says you need 450W, that means that it is the MAX you will need for that card. You may never need that much. But it is always good to upyour PSU, so that you do not have to worry about it later when you update your system.
If I was you, go on Ebay and grab a GTX 465 then get this PSU.
Newegg.com - Antec EarthWatts EA-650 GREEN 650W ATX12V v2.3 SLI Ready CrossFire Certified 80 PLUS BRONZE Certified Active PFC Power Supply
It would be loads better than something like a 6770.