How to know which graphics card is compatible with a computer

Hi , i have been thinking about to buy a new Nvidia GTX 660 and replace my old GT 430 becouse some i'm playing some of the newest games like Tomb Raider and i want to run them with better graphics and more FTS , but i need help becouse I don't know if my computer is comatible with the GTX 660 so please help. :D

My specs:

Processor: AMD Athlon II -250 X2 3.0 GHz
Motherboard: Biostar; NF520D3, AM3, nForce520
Graphics Card: EVGA; GeForce GT430 ; 1024MB; DDR3
RAM: Transcend; DDR3 4GB 1333MHz
Hard disk: Hitachi; 1TB; 16MB L2 Cache
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More about graphics card compatible computer
  1. There are 3 things you need to consider when upgrading a graphics card.

    1. Motherboard: Must have PCI-e 16x 2.0/3.0 expansion slot
    2. Power supply: Must be large enough to power new graphics card
    3. Case: Must be large enough to fit new graphics card

    Based on the info you have provided, your motherboard is compatible with the GTX 660. Your PSU/Case compatibility is unknown.
  2. Thanks , but how can i check the power supply?
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