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Old 01-13-2013, 04:18 AM   #1
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Default PSU Requirements

Hi all,

Was after a little advice really.

I'm currently running an AMD fx6100, one hard drive, one DVD drive, 8gb Ddr 3 and a hd5450 graphics card.

I'm looking to upgrade my graphics to a hd7770 but was wondering if my psu will be able to handle it.

Its not a well known make but it says 700watt, 38amp on one 12v rails.

Is that enough for my graphics upgrade, can't really afford to fork out on a new psu as well.

Thanks.
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Old 01-13-2013, 05:24 AM   #2
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Default Re: PSU Requirements

Hi Mangotango

Most HD7770s require a 500w PSU and one or two 6pin power connectors so your PSU should be OK to go
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Old 01-13-2013, 05:57 AM   #3
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Thanks, I think the hd7770 I was looking at was a vtx xtreme version with one six pin connector but it doesn't state the power requirements
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Old 01-13-2013, 06:02 AM   #4
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Default Re: PSU Requirements

This should answer you question AMD Radeon
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Old 01-13-2013, 06:12 AM   #5
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Thanks, I've already checked the specs page, it doesn't list the tdp for the card, just the recommended psu so I can't calculate the amperage requirement. I know pcs inside and out but psu requirements are my achilles heal so to speak, I can never convince myself that the specs are ok until I've had a second opinion. I know the idle power draw is 106watts but i don't know what it is under full load, which is my worry. Don't want the psu to blow after a few hours of decent gaming.
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Old 01-13-2013, 06:47 AM   #6
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Default Re: PSU Requirements

Your PSU will run the HD7770.
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Old 01-14-2013, 12:27 PM   #7
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Ok so I checked my powr supply. It says 700watt and 38amp on the 12v rail. But when I do the maths. 38amps multiplied by 12v rating I get 456watts! When I do the maths in the opposite 700watt divided by the 12v I get 53amps! So what am I missing? Is it because its a cheap psu and its actually only 450watts continuous and 700 watt peak?
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