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post #11 of 52
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Quote:
Originally Posted by icehotshot View Post

Well there is only a couple percentage points difference between Gold and Platinum. The question is does it really matter to you if your PSU is 88% efficient instead of 90%? The 80 Plus rating shouldn't have an effect on how stable your voltage are though which is what matters most.

Having a higher efficient psu means you pull less power from the wall but with a 2-3% difference between gold and platinum your looking at like a 25-30 watt difference of power pulled at the wall.

http://en.wikipedia.org/wiki/80_Plus

Good to know. So it really all depends on how much I want to spend on the PSU and how much I might wantto spend in the long run. Might be better for me to drop a few extra dollars now and save more later on with the power company being really stupid during the summer on pricing due to everyone running their AC units.
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post #12 of 52
Quote:
Originally Posted by khaosstrife View Post

Good to know. So it really all depends on how much I want to spend on the PSU and how much I might wantto spend in the long run. Might be better for me to drop a few extra dollars now and save more later on with the power company being really stupid during the summer on pricing due to everyone running their AC units.

Exactly. A higher 80 Plus rating just means your PSU is more efficient therefore lowering the power you draw from the wall. Also as a psu gets more efficient it generates less heat because less power is being lost as heat when the PSU converts AC to DC.
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post #13 of 52
Quote:
Originally Posted by icehotshot View Post

Quote:
Originally Posted by driftingforlife View Post


Get a Enermax platimax 1500W if you want the best,

I agree 1500W should be more than enough for your setup.

From this Guru3d review they calculated the power consumption of a 7970 to be 195W. So say 250W per card overclocked is only 1000watts. That leaves you 500W for everything else which is plenty.


So my quad rig only uses 1000w on the gpus huh? I guess there's no sense in posting pics showing 1800w+ draws then...

Warning: Spoiler! (Click to show)
Quote:
Originally Posted by tsm106 View Post

Quote:
Originally Posted by KaRLiToS View Post

HD 7970 : TDP of 300w with 20% Power Tune (250w stock but if you overclock, calculate 300w)


So I was benching just a lil bit ago and it dawned on me that I could measure each cards draw independently lol! I have an 2nd psu for benching and a killawatt, score.

Plug only the gpu into the 2nd psu. Hook that up to killawatt. Get your psu's proven efficiency factors off the net, I use jonnyguru. I was benching Firestrike (chasing the Titans lol) so this is from that.
Quote:
Results from Silverstone ST1500 COLD load tests
Test # +3.3V +5V +12V DC Watts/AC Watts Eff. Intake/Exhaust Simulated system load tests

1 3A 3A 22A 303W/347W 87.3% 21°C/28°C

Note, the max I saw was 345W but I was only able to capture the pic after it dropped. Use the pics for illustration.





This 345W measurement is off my 4th gpu. Here's what I was benching. Bah, futuremark really blew the quad tahiti scaling, but trifire is working good.

http://www.3dmark.com/hall-of-fame-2/fire+strike+3dmark+score+extreme+preset/version+1.1/4+gpu
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post #14 of 52
Quote:
Originally Posted by tsm106 View Post

So my quad rig only uses 1000w on the gpus huh? I guess there's no sense in posting pics showing 1800w+ draws then...

Warning: Spoiler! (Click to show)

I still don't see how you get 1800W+.

So you say the max you saw from your psu was 345W FROM THE WALL for a single, most likely VERY HEAVILY oc'd card during FURMARK not gaming, right?
Factor in 87% efficient psu and that is 300W for each card at MAX which most likely you will never see in while gaming.

So 300W*4 cards = 1200W which still leaves more than enough room for everything else with a 1500W psu. And that is if you are running furmark all day. Less for games.
Edited by icehotshot - 5/23/13 at 9:48am
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post #15 of 52
Quote:
Originally Posted by khaosstrife View Post

Also upon more digging and running more calulations I am going to need at least 1700 watts to run this and that is with almost no head room. Looking into the legendary 2000 watt PSUs.....

1500W is more than enough for a Quad 7970 configuration. If you go MORE than 1500W, you're also going to require a 20A 120V outlet, circuit breaker, and wiring installed at your house/office due to wiring limitations. Standard wiring in the USA for bedrooms is a 15A 120V circuit, and that includes your monitor, lighting, etc. in the room.

BTW - Furmark has no bearing or relation whatsoever to what your power consumption will be under gaming. There are two schools of thought here - size your PSU for what you're going to be doing with your PC, e.g. gaming, or size it for the maximum power consumption you can possibly draw, e.g. synthetic benching of GPU + CPU at the same time. I'd go with the first.

Greg
Edited by hammong - 5/23/13 at 9:59am
post #16 of 52
Lets do some simple math to settle something:

A dual 7970 rig can be happily run at 750w, but to be generous, I'll say 800. That means you can run TWO dual 7970 computers with a max power draw of 1600w. Now subtract the second CPU, sets of ram, hdd's, fans, etc and you easily shave off more than 100w. Thus 1600-100 = 1500w at an absolute max.
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post #17 of 52
I was able to run four 7970 Lightnings at 1100/1600 along with a heavily overclocked i7 965 (for the HWBot Team Cup) on my AX1200. The power draw was probably close to 1300W because if I tried 1150 on the core the system would shut down almost immediately (all GPU's are good to at least 1250 in single card). I even had to use Molex to 6-pin and 6-pin to 8-pin adapters to get it all off the same PSU lol.

With this in mind, I'd say you'll be good with a 1500W PSU.

Proof:





http://hwbot.org/submission/2371488_

(The score is so low because of a huge bottleneck from such an old chip)
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post #18 of 52
I recently traded / sold my 4 X eVGA GTX 680 Classified Hydro Copper for 4 X Reference HD 7970 (And 500 USD) and everything is working just fine - Have not encountered a single hiccup and besides gaming / benching (Which is just as great and still serving every single purpose I can throw at them) I am now able to bitmine at an EXTREME higher hash-rate than I could on the Nvidia.

I did however do a fresh windows installation as the very first thing after installation - I am pretty sure that helped me avoid some of the smaller problems that could occur smile.gif

Running on the Enermax Maxrevo 1500W - Clocked 1200/1600.
Edited by Gomi - 5/24/13 at 12:11pm
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post #19 of 52
Quote:
Originally Posted by icehotshot View Post

Well there are only a couple percentage points difference between Gold and Platinum. The question is does it really matter to you if your PSU is 88% efficient instead of 90%? The 80 Plus rating shouldn't have an effect on how stable your voltage are though which is what matters most.

Having a higher efficient psu means you pull less power from the wall but with a 2-3% difference between gold and platinum your looking at like a 25-30 watt difference max of power pulled at the wall.

http://en.wikipedia.org/wiki/80_Plus

Like I said, the 80 plus rating shouldn't have too much to do with whether a psu is quality or not as far as the ripple and voltage output are concerned.

Wise words!
post #20 of 52
Also the Maxrevo 1500w is rated up to 1650w. It says it right on the box. Got mine yesterday! BTW hello from MA!! I live about 20 minutes from Nashua. Feel free to message me if you need any help.

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