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Gtx 460 and hd 7770, help me with my question!

I am deciding between buying a gtx 460 and an antec neo eco 520w, or buying an hd 7770 and running it off my existing Dynex 400w psu.
The hd 7770 would cost about $120.
The gtx 460 + power supply would cost quite a bit more. Around $160.
So here's the thing: I know simply buying the hd 7770 is cheaper, but I'm worried about using my old Dynex 400w with it. I feel it might be better to get a new psu, but if I do, I don't have much for the gpu.
So.. Any ideas?
Thanks guys

P.S. Again I'm not asking whether to buy solely a gtx 460 or a hd 7770, it's the power issue I want to know about.
9 answers Last reply Best Answer
More about 7770 question
  1. Now that I think about it, I could try to catch the HD 7770 on a sale and that would take care of the problem, and I could get a PSU as well.
  2. Best answer
    That Dynex is a PSU-shaped object. It is, perhaps, a 200W PSU: http://www.hardocp.com/article/2008/05/13/getting_best_buy_on_power_supply/
    Do not use it; it will die and may kill attached parts.
  3. Does anyone have a recommended psu for the hd 7770 that costs around 40 dollars?
  4. Onus said:
    That Dynex is a PSU-shaped object. It is, perhaps, a 200W PSU: http://www.hardocp.com/article/2008/05/13/getting_best_buy_on_power_supply/
    Do not use it; it will die and may kill attached parts.

    K I'll be sure to get a new psu for the hd 7770. Any suggestions?
  5. The Antec VP-450 is a decent PSU, and only $39. For $40, you can get a 400W Neo Eco. They're both decent PSUs. The VP-450 isn't 80+, but don't be deceived; it is efficient enough (it might make Bronze), but is disqualified for not having active PFC.
  6. AMD site recommends a 500 watt PSU, but any QUALITY 450 watt PSU would do. Like a Seasonic, Corsair, Antec.
  7. The V2 Corsair Builders are not up to Corsair's past high standards. They review well, but have been found to use inferior Samxon capacitors that may not hold up.
  8. Best answer selected by Arcticwonder.
  9. Thanks. Enjoy your upgrades!
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