Will this graphic card work on my computer?

I think you would need a bigger power supply to run those cards, unfortunately.

Yep 300watt is to small but would run a HD6670 or HD7750 if modern.

Then how many watt do I need? In addition, will I experience over heating problems if I use these cards?

The cheapest I would buy http://www.newegg.com/Product/Product.aspx?Item=N82E168...

You could run up to a 6950 or GTX560ti before being bottlenecked by your processor.But as everyone else has said you will need to upgrade your PSU if you intend to use those cards.But depending on your budget perhaps you can get a better card...

What's your budget for the PSU?

What is your budget for the graphics card?

you are probably cutting it close with a 430W PSU a 500-600W PSU would be the best bet

My budget on PSU is around 30-50 dollars, and my budget on graphic card is around 100-140.

How about CoolerMaster eXtreme Power Plus RS-500-PCAR-A3 Power supply - 500 Watt

GTX550 demands 400watt and 460 450watt based on generic crap PSU's.

I think what rolli59 meant what the CORSAIR Builder Series CX430 V2 is the best Power Supply for the money.

Yep that ZS is a nice unit with power to spare.

Best answer selected by minibot7.

This topic has been closed by Mousemonkey