Psu requirements for 3 way sli gtx titan z gpuz

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Deehomes

Deehomes

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If this is a gaming PC, it's COMPLETE overkill and a waste of money. If its a workstation, You'd be better off either getting 2x Titan X's or go for Nvidia's Quadro line of GPU's. 3x Titan Z's are theoretically 6 GPU's which would scale horribly.
 
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Vlad Rose

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Chances are you'll need 2 power supplies since the largest consumer power supply is 1600 watt. If you're in the US, a wall outlet can only put out on average 1800 watts (120v*15a). In that case, you may have to have the machine run on two separate circuits in the house as well.

EVGA 1600watt: http://www.newegg.com/Product/Product.aspx?Item=N82E16817438041

http://www.tomshardware.com/forum/331002-28-watts-standard-outlet

BTW, that 700watt rating looks to be a little high on gigabyte's spec sheet as guru3d had tested a typical titan-z at around 480watts. Even so, it is 1440 watts in video cards alone on 3 way sli.

http://www.guru3d.com/articles-pages/nvidia-geforce-gtx-titan-z-review,7.html
 
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Derza10

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Those ratings are taken from the wall, a 80+ effiency 1600w PSU is going to pull the max 1800w from the wall. 1600w Will be plenty for 3 Titan z's . If this is a gaming computer Two Titan X's would be your best option though, 3 tops.

(Say its a 90% efficient 1600w PSU, it will pull about 1780w from the wall to supply the computer with 1600w of power)

So using the readings from that review the cards will at max pull 1437 from the wall, leaving 343w (1780w-1437w) of power for the CPU and the rest of the computer ( rest of the computer MIGHT use 200w-250w of that), So you will have about 100-150w of headroom with the system running at 100% on all video cards and CPU - this will rarely if ever happen, so on average "high load" i'd guess you might use 1000w, maybe 1200w.
 
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Vlad Rose

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I'm aware about the efficiency rating.
In regards to 1600w being enough for 3 titan z's, you'll have 160 watts left for all other components in your system according to the article above. If overclocking or exotic cooling is planned, it will definitely drive that over the 160 watt limit. And if someone is even looking at 3way titan z sli, why wouldn't they go for overclocking and crazy cooling. :)
 
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Derza10

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No, you will have 343w for the system... The review uses the value at the wall, so you need to use what the PSU can pull FROM THE WALL. I had updated my previous post if you want to see the calculations.

We still need to know what this computer is going to be used for, will change a lot of the recommendations.
 
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Vlad Rose

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Yeah, i do know how efficiency works; I just didn't realize the article used the power draw from the wall itself and not the computer... guess I should have read that part closer.... LOL

"Mind you, the system wattage is measured at the wall socket side and there are other variables like PSU power efficiency. So this is an estimated value, albeit a very good one. "

Even then, their recommendation for a single card is 850 watts and 1200 watts for sli. Since that's 350 watts just to add another card, it sounds you'd be cutting it close at 1600 watts.
 
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