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you CAN run gtx 480's and an OC'd proccessor on an HX850! - Page 3

post #21 of 77
Quote:
Originally Posted by Slappa View Post
dude that could even be handled on a good 650 watt PSU
Quote:
Originally Posted by DSF_x View Post
i doubt that, 850 fits the bill nicely. 750 phaederus said would be a bit risky, but still may work.
With a single gtx480 (like his sig rig), a 650W can easily handle it. 2xGtx480 not so much lol.
post #22 of 77
Quote:
Originally Posted by DSF_x View Post
lot's of people said no, but my sig rig, runs fine, i've even furmarked on it!

so that's the answer to everyone who said it wouldn't work, it does.
Finally.

If I had a nickel for every single time I said that this is possible, then I'd be very wealthy right now. If I had a nickel for every single time I had someone tell me that I'm wrong, then I'd have been able to build a very nice SB system.
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post #23 of 77
Heavily overclocked 480s, talking >1.12v on each will eat a 70a for breakfast and want more.
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post #24 of 77
Quote:
Originally Posted by pursuinginsanity View Post
Regardless. Anandtech's bench is showing 668 watts at load playing Crysis for two 480s (with an unknown, almost guaranteed to be stock CPU). http://www.anandtech.com/bench/Product/310?vs=312

Who would risk such a system with a 650 watt PSU?
That's 668W from the wall. If I assume 85% efficiency, then that would mean the system pulled about 568W from the power supply. If I factor in about 150W for everything else in the system, then that would be close to 720W being pulled from the PSU under the most extreme loads.

So an extremely high quality 650W might be fine (I personally wouldn't try it), but a high quality 750W is the best choice to power a system with two GTX 480s in it while a quality 850W unit is even better.

For example, knoxy_14 is correct: the SeaSonic X-750 would be fine.
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post #25 of 77
They will eat 70a, entire system included.
I pushed mine until my kill a watt read 1200w on more than one occasion, shut down every time.

A good 850w such as the HX is fine for moderate to high overclocks, but I'm telling you in the 1.14v range, look out.
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post #26 of 77
An 850W would power it fine yes but,

Just because your system runs them doesn't mean it is working correctly you have no other means of testing apart from stress tests and even then you aren't collating readings from the PSU.


Yes the HX850W is adequate, but then again a 650W may power them and be causing problems with inadequate power output. Without a proper means of testing it cannot be 100% determined.
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post #27 of 77
GTX 480's consume lots of power when overclocked. Low overclocks on a 480 SLI could work on a HX-850. Highly overclocked 480 SLI is iffy on a HX-850. 1000W+ seem to be safer for 480 SLI.
post #28 of 77
Tom's Hardware was able to get their test system to pull 682W from the wall outlet with two GTX 480s in their system:




If I assume 85% power supply efficiency, then that would mean that the system pulled about 580W from the power supply. If I add the recommended 150W to account for everything else in the system, then that would come to almost 730W being pulled from the power supply.
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post #29 of 77
i had i7 X58 @ 4.2 ghz . and 2 480s @ 850 cores. on a tx 750 , Now it ran it. but if I played a game and thne shut off rig. the psu fan would go for like 5 mins trying to cool it off. Now your cpu is lower in watts. and if you dotn push to hard ya. but corsair makes good psu
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post #30 of 77
Quote:
Originally Posted by TwoCables View Post
Tom's Hardware was able to get their test system to pull 682W from the wall outlet with two GTX 480s in their system:




If I assume 85% power supply efficiency, then that would mean that the system pulled about 580W from the power supply. If I add the recommended 150W to account for everything else in the system, then that would come to almost 730W being pulled from the power supply.
361w on a stock 480 during furmark, stock being anywhere from .98v to 1.03v.

Add in a moderate oc, say 1.1v, and your looking at an additional 100w.

The HX850(70a) is the minimum I would recommend for sli 480, that would only be if the system was slim.
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