Can my PC handle new graphic card?

Hello.
Can my PC handle a new graphic card which I will buy (Asus GeForce GTX560 Ti, 2 GB, PCI-E (ENGTX560 TI DC2/2GD5))?
Well, I think my PSU cannot handle it so, I'm posting here. Well, my PSU is: Spire SP-ATX-420W TN-PFC | www.spirepower.com.

If you need my old graphic card information, here it is: NVIDIA GeForce 9400 GT.

Thanks in advance! And tell me if you need more information.
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  1. No i am pretty sure your PSU cannot i recommend you buy a new one here is a very reliable PSU for a amazing price that would serve you well. PSU:SeaSonic M12II 520 Bronze 520W ATX12V v2.3 / EPS 12V v2.91 SLI Ready 80 PLUS BRONZE Certified Modular Active PFC Power Supply $59.99
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817151093#top
  2. What CPU do you have?
  3. Pentium(R) Dual-Core CPU E5200 @ 2.50GHz (2 CPUs), ~2.5GHz
  4. $50 for 550 watts after $15 promo and $10 MIR .... 9.5 jonnyguru performance rating
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013

    Ya might wanna keep that 9400GT (adds 87 watts) for PhysX though in which case Id get something a bit bigger. A typical system w/ a 560 wants 500 watts

    http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-560ti/specifications

    So ya just might make it with the 550, though I'd want a 650.

    Corsair TX650 V2 and XFX Core Edition 650 are both $80
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139020
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817207014
  5. Pentium might bottleneck the 560, be carefull.

    Is it a 775 CPU or a 1155 CPU?
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