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Power requirements of 7850/7870?

#1Nazgl5LordofNazPosted 6/3/2012 7:04:15 PM
I have a 460W PSU in my rig right now. Yeah, not that great. Anyways, I'm thinking of upgrading my 6770 to one of the above (final decision will be based on how much money I can scrounge up over the next while), but I'm not sure if I'm going to need a new power supply just to make it work.

http://images.anandtech.com/graphs/graph5625/44655.png

I can see that they're a lot more efficient than the higher-end cards from last generation, but I'm pretty sure my wimpy little 6770 wasn't drawing nearly that much power in the first place. Judging from those numbers alone I get the feeling that the answer will be a yes, so...if so, what should I be looking at? Corsair, maybe 600W? PSUs are not my field of expertise.
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#2Shadow EdgePosted 6/3/2012 7:09:04 PM
If that 460W is a decent one you're fine. You can even drop to 420W and still be just fine. 6770 consumes ~30W less than 6850.
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#3Nazgl5LordofNaz(Topic Creator)Posted 6/3/2012 7:11:34 PM
I....I didn't build this computer myself. </shame> I'm fairly sure it isn't a decent one. : \
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#4Ichigo619Posted 6/3/2012 7:15:34 PM
Its probably not a good one. Look inside and tell us the model of it
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#5Nazgl5LordofNaz(Topic Creator)Posted 6/3/2012 7:18:08 PM
That might take some time, since someone's using it at the moment. I can tell you the voltage, but I don't know if that's any use at all.

100-127V/3A (50-60Hz)
200-240V/2A (50-60Hz)
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#6Shadow EdgePosted 6/3/2012 7:20:11 PM(edited)
If your PSU is mounted on top of the case, there's a chance you'd have to remove the PSU just to see the sticker. If you find the receipt you can probably check it too.

If not, you should just get a PSU. A 500W Corsair or Seasonic are more than enough for any single GPU setup.

edit: We need the exact brand and model of the PSU. Wattage/voltage/amperage ratings aren't all reliable.

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#7ShubPosted 6/3/2012 7:31:04 PM
Is it a Dell PSU? If so, it's fine.
Or perhaps it's a Cooler Master Elite 460? If so, it's not fine.
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