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Triple Sli GTX 580 3gb power supply recommendation. - Page 6

Poll Results: Triple SLI GTX 580 3gb 1000w (keep) or 1200w (upgrade).

 
  • 28% (13)
    Keep the 1000w psu.
  • 71% (33)
    Upgrade to a 1200w psu.
46 Total Votes  
post #51 of 61
Thread Starter 
Quote:
Originally Posted by Ishinomori View Post
I've voted that your 1000w (92% efficiency GOLD) will be plenty, on the assumption that you wont be folding 24/7

Based on a Guru3D review where they measured 736w PEAK during all their testing.

EDIT: That was the cards themselves, and the whole system pulled 933w at peak.

EDIT2: And they are using a 1200w PSU, so that might be the way to go, lol

Source
Lol, that reviewed still kept me on the fence. You see how this question does not show a conclusive answer .

I shall be ordering another 580 soon and the third will be ordered as soon as my last 6950 sells. If I still have my psu (most likely), than I shall run test and report back (I mentioned this before ) with some kil-a-watt readings
post #52 of 61
As has been said, the Antec HCP-1200 is boss. I upgraded from an HX1000 that handled it fine though.
 
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KillTheBananas
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post #53 of 61
if you run the Kill-a-watt now, and then when you get your 2nd 580, you should be able to judge how much the third one will pull (In your setup) based on the increase from 1 to 2...

Food for thought.
post #54 of 61
BTW, here are some numbers from my HX1000 before I upgraded to the HCP-1200.
 
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PS/2 Antec Earthwatts 650w Antec 900 Optical 
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Realtek 
CPUMotherboardGraphicsRAM
AMD Athlon 64 X2 4200+ @ 2.2Ghz Tyan Tomcat S2866 PNY 8600GT 2x 1Gb, 2x 512MB Mix'n'match 
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160GB WD don't remember XP x86 19" HannStar 1440x900 
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MiMO 7" USB Monitor PS/2 450W something Antec mid 
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Dell hmmm no need 
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KillTheBananas
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WD Caviar Blue 250GB 2x LiteOn DVD-RW Windows 7 Ultimate x64 HannsG Hi221D 22" 1680 x 1050 
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PS/2 Antec Earthwatts 650w Antec 900 Optical 
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Realtek 
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160GB WD don't remember XP x86 19" HannStar 1440x900 
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MiMO 7" USB Monitor PS/2 450W something Antec mid 
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Dell hmmm no need 
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post #55 of 61
Thread Starter 
I'm still unclear of this whole efficiency figures. For example, my psu has:

Quote:
Model

Brand
OCZ

Model
OCZ-ZX1000W

Series
ZX Series

Spec

Type
ATX12V v2.2 / EPS12V

Maximum Power
1000W

PFC
Active

Main Connector
20+4Pin

+12V Rails
Single

PCI-Express Connector
6 x 6+2-Pin

Efficiency
92%

Energy-Efficient
80 PLUS GOLD Certified

Over Voltage Protection
Yes

Input Voltage
100 - 240 V

Input Frequency Range
50/60 Hz

Input Current
15A - 8A

Output
+3.3V@30A, +5V@30A, +12V1@83A, -12V@0.6A, +5VSB@3.0A
Running Pheadrus experiment, I pulled 1115w on three medium oc 6950/70s and 4.9 on my cpu. Do I multiply that by 92% efficiency or 80% "Gold Plus Rated"?

@ 92% = 1025.8w
@80% = 892w

post #56 of 61
I have i7 970 @ 4.4ghz with SLI GTX 580(950 core@ 1.1v) with 18 fans and dual wc pumps and it uses aroung 850 watts while folding @ 100%. Some times I run a 3rd card and it uses 1k watts. I have an AX1200 and is an awesome ps. If you are going to run benchmarks or fold I would get a 1200 watt psu just for a little headroom. There is no such thing as overkill but there is something called regret when you cut corners. Just my
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post #57 of 61
Quote:
Originally Posted by wermad View Post
I'm still unclear of this whole efficiency figures. For example, my psu has:



Running Pheadrus experiment, I pulled 1115w on three medium oc 6950/70s and 4.9 on my cpu. Do I multiply that by 92% efficiency or 80% "Gold Plus Rated"?

@ 92% = 1025.8w
@80% = 892w

You would multiply it by 92 percent although it is not exactly that number since the efficiency curve changes depending upon the load and temperature of the PSU.

At stock, the max TDP of the 6970 is 250W. However since you run PowerTune @ +20% for each card and added voltage, the 6970 is closer to a 300W card.

The 580 is about a 250W card at stock. Now when you overclock, it is probably way over 300W card. 580's consume more power than the 6970's when overclocked too.



These numbers are from the wall with a 980x hexcore @ 4.2 GHz, ssd, dvd drive, and ax1200. Assuming 88 percent efficiency, that is 756W DC for the overclocked 580 2-way SLI.

That is why I said the 1000W OCZ would run that at stock fine. However, OP is going to put it under water and pump it with lots of volts, it makes me on the fence.
Edited by Riou - 7/30/11 at 6:38am
post #58 of 61
Did you say watercooling? I must've missed that part.
Factoring in alot more fans, pumps, etc, you will need alot of juice...

Quote:
Originally Posted by Ishinomori View Post
if you run the Kill-a-watt now, and then when you get your 2nd 580, you should be able to judge how much the third one will pull (In your setup) based on the increase from 1 to 2...
I still stand by this though
post #59 of 61
Quote:
Originally Posted by wermad View Post
I'm still unclear of this whole efficiency figures. For example, my psu has:



Running Pheadrus experiment, I pulled 1115w on three medium oc 6950/70s and 4.9 on my cpu. Do I multiply that by 92% efficiency or 80% "Gold Plus Rated"?

@ 92% = 1025.8w
@80% = 892w

The efficiency isn't really 92%. Efficiency is different between every PSU and changes over the range of loads too. If you trust jonny's power meter:

http://www.jonnyguru.com/modules.php...tory3&reid=238

Look at the cold load tests, since your PSU is drawing air from outside the case. At near 100% load, the measured efficiency was 86%. With crossload test 2 (100% load but all +12V), the measured efficiency was 88%. You'd be drawing almost all power from +12V but some from the other rails too, so I'd expect efficiency to be between 88% and 86%--though probably closer to 88%. That's because the percentage of draw from +3.3V and +5V would be between his 100% load test (Test 8) and between his crossload test 2. Extra +3.3V and +5V draw reduces efficiency, particularly for that design of PSU.

That's why I mentioned before that at full load, the power supply is around 87% efficiency for around 970W power draw. Maybe slightly higher.

That's my rationale behind saying that you'd exceed 1000W with 3 GTX 580s, in a similar test. However, normally you never draw that much power, so I think the OCZ ZX1000 would be plenty fine for any kind of realistic usage. Folding or gaming load should be well under 1000W.
post #60 of 61
Thread Starter 
So, I emailed ocz about the rail/cap whine on my psu. Their techsupport insist that its my cards. I told them I have ran 470s and 6950 and will run 580s soon and that the noise is present regardless. They advised me to lower my card and game settings and turning on vsync. Now my old TT 1.2kw had no issue powering on three 470s and I'm sure this setup and three 6950s were not maxing out the psu. Again, they replied to lower my settings. I fired back that I'm not going to sacrifice performance to mask a defect on their psu. I've read numerous reviews on newegg about the same issue on the 1k and 1.25k units. They replied that an rma is possible but their rma department wants to know whats is wrong. Wth??? I'm going to load a youtube vid and send it to them. Now I'm more than ready to get a new psu. If I do get the rma, the replacement will be promptly sold after testing it.
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