GTX 770 w/ Antec TPQ-850 PSU

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jerreece

jerreece

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Sep 7, 2006
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Just ordered an EVGA GTX 770 SC ACX video card. This will replace my aging GTX 470 SLI setup. Hopefully it'll be quieter, cooler, and a little faster. Only thing I'm concerned about is a review I saw for this particular card said it requires at least 42A of power on the +12v rail.

The Antec TPQ-850 I'm using has 4 individual +12V rails which are 18A each. Since I'd be running two power connectors I'd theoretically be running on two rails with a total of 36A.

Thing is, don't they recommend 42A for the GTX 470/480 cards as well? I've been running two GTX 470's on this PSU for a couple years!! The TDP for the GTX 470 is 215Watts from what I can tell. Any power junkies have any reasonable input?

The EVGA GTX 770 SC ACX has a TDP of 230W. So 230W @ 12V = 19.16A?
 
Solution
ksham
Rails are not addictive. Otherwise, by your math, you would have 18A * 4 rails * 12V = 864W. That's more than 850W. You need to look at the total amp provided by all rails. The total combined amps in your PSU is 64A, with a total max combined watt of 768W. So you'll be fine. :)
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ksham

ksham

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Mar 29, 2013
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Rails are not addictive. Otherwise, by your math, you would have 18A * 4 rails * 12V = 864W. That's more than 850W. You need to look at the total amp provided by all rails. The total combined amps in your PSU is 64A, with a total max combined watt of 768W. So you'll be fine. :)
 
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Solution
jerreece

jerreece

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Sep 7, 2006
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So in "theory" I should be able to SLI the GTX 770 then (though I don't plan to at this point). If it can provide 768W (two cards TDP = 460W). This would give me headroom to run other items (CPU, Hard Drives, etc). Granted as I understand the PSU degrades over it's life span.
 
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jerreece

jerreece

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Sep 7, 2006
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I use the word "theory" because as the PSU degrades it's max capabilities may not always be true. Always a chance things don't go as planned and nothing has a guarantee. ;)
 
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