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Radeon 7770 vs 7780

Last response: in Graphics & Displays
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February 23, 2013 10:40:30 PM

The title says it all^ Radeon 7770 vs 7780, also will they work with 350 WATT PSU or 400 WATT and do they need a pcie connector thanks ;) 

More about : radeon 7770 7780

February 24, 2013 2:31:27 AM

not quite sure if the 7780 even exists
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February 24, 2013 2:41:31 AM

Yes, they need pcie connectors.
7770: 500W recommended, but less might do. 6 pin 75W connector is needed.
7750: 400W recommended, again you could scrape by with less. no extra connectors is nice, though.
7850: same pwr reqs as 7770,
7780 does not exist. you may have meant these.
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February 24, 2013 2:48:46 AM

feeblepenguin said:
Yes, they need pcie connectors.
7770: 500W recommended, but less might do. 6 pin 75W connector is needed.
7750: 400W recommended, again you could scrape by with less. no extra connectors is nice, though.
7850: same pwr reqs as 7770,
7780 does not exist. you may have meant these.

ok first I meant 7850 (not 7780) and second; my power supply is 500 WATT it sais that its got a continues rating of 400 WATT however I emailed Thermaltake and they said it will run at 450 WATT comfortably BUT everybody on the forums say 300-350 WATTS I don't understand; I looked on the side of the PSU itself, its got a rating of 400 WATT, max output of 500 WATT PLEASE TELL ME EXACTLY WHAT THIS IS!!

DC OUTPUT +3.3V +5V1 +12V1 +12V2 -12V +5VSB
Max Output Current 25A 28A 14A 15A 0.3A 2.0A
Min Output Current 0.5A 0.3A 1.0A 1.0A 0A 0A

PSU specs ^ (from website)
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a b U Graphics card
February 24, 2013 2:54:58 AM

What specific PSU do you have? 7850 would be the best choice if you can afford it.
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a b U Graphics card
February 24, 2013 2:55:57 AM

You'll be able to run the 7850 fine on your psu. I ran mine on a delta PSU with the same 12v rails

The forums likely mean 300-350W 12v draw while thermaltake meant total power is spread evenly from 3.3 and 5 and both 12v's
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a b U Graphics card
February 25, 2013 2:34:44 PM

That PSU comes with a 6-pin pci power connector (needed for both 7770 and 7850), should have enough 12V amps available, and 400W continuous power rating is plenty, so I'd get the 7850 if you can swing it.
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