I want to buy a graphics card that can support my ** LGA 775** motherboard with E7500 processor. Also I have a ** 450W PSU**. Please Suggest some good graphics card which i could use for gaming without exceeding my PSU rating? I have Nvidia GT630 DDR3 and 550 or 650 in mind, what do you guys think i should buy?

The processor you have and the GT650 should be okay with your PSU in terms of Wattage, in theory. But there are other considerations such as the quality and age of your PSU, amperage, what other hardware is running off it.

It's never a good thing to have a PSU running at near capacity.

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