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Can 1000w support a trifire 6950 setup? - Page 4

post #31 of 40
Quote:
Originally Posted by Shub View Post
That's incorrect, the AX1200 is the only unit on the market using that particular design. You're thinking of the Corsair HX1000 and a number of other PSUs from various companies including the ToughPower 1500W that do share the same design (CWT PUC).

As for the original question, yes, a 850W would be fine for that, although contrary to most of the recommendations in this topic, I would recommend against the Corsair AX850 on account that it only has four PCIe connections, and you will need six for a trio of 6950s.
Oh, sorry. Thanks for correcting me.

Still, I would expect the AX1200 to put out 1500W albeit at a lower efficiency.
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post #32 of 40
Quote:
Originally Posted by Blindsay View Post
perhaps someone can explain it to me (not trying to be rude but i want to understand) how when i use phaedrus's calculator in the other thread i come up with 850w - 900w for my system but he is ok running 3 6950s on the same wattage as me?
Because just like every other calculator, it has its flaws. Perhaps it was just a mis calculation by Phaedrus? Who knows. Your machine would work flawlessly off a good 750w though.
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post #33 of 40
Quote:
Originally Posted by pioneerisloud View Post
Because just like every other calculator, it has its flaws. Perhaps it was just a mis calculation by Phaedrus? Who knows. Your machine would work flawlessly off a good 750w though.
Doesn't Phaedrus' calculator assume a 50% overclock, a couple >3000 RPM fans, etc? And I think Phaedrus would also recommend having bit of headroom...
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post #34 of 40
Quote:
Originally Posted by Blindsay View Post
perhaps someone can explain it to me (not trying to be rude but i want to understand) how when i use phaedrus's calculator in the other thread i come up with 850w - 900w for my system but he is ok running 3 6950s on the same wattage as me?
You should come up with 800W using his calculator before your RAID array comes into account. His calculator accounts for overclocks on your processor and GPUs and keeps headroom on the PSU.

650W for a CFX 6970 system
+75W for Hexacore Nehalems (i7 970)
+25W for Water cooling
+50W for both GPUs voltage tweaked

As for a Tri-fire 6950 setup on a i7 2600k on standard aircooling, 850-900W would suffice.
Edited by KittensMewMew - 8/10/11 at 5:37pm
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post #35 of 40
Quote:
Originally Posted by Usario View Post
Doesn't Phaedrus' calculator assume a 50% overclock, a couple >3000 RPM fans, etc? And I think Phaedrus would also recommend having bit of headroom...
I'm honestly not sure how he came up with his numbers. You could always ask him what he'd recommend for your setup though. He told me that my TruePower New 650 would handle 470's in SLI with my Sandy Bridge setup. Those are about the same amount of power as 6950's are.
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post #36 of 40
Quote:
Originally Posted by KittensMewMew View Post
You should come up with 800W using his calculator before your RAID array comes into account. His calculator accounts for overclocks on your processor and GPUs and keeps headroom on the PSU.

650W for a CFX 6970 system
+75W for Hexacore Nehalems (i7 970)
+25W for Water cooling
+50W for both GPUs voltage tweaked

As for a Tri-fire 6950 setup on a i7 2600k on standard aircooling, 850-900W would suffice.
650W for a CFX 6970 system
+75W for Hexacore Nehalems (i7 970)
+25W for Water cooling
+50W for both GPUs voltage tweaked
+100W for both GPUs power cap +20%

900W

"If Power Cap +20%, (HD6900 series only) then +50W per GPU"

even if you only had 2 on a 2600k system with air cooled gpu

650W for a CFX 6970 system
+50W for both GPUs voltage tweaked
+100W for both GPUs power cap +20%

800W

so im not sure how you can run a third on there on 850w?

edit: anyone have any idea what wattage would cause my AX850 to shut off? since there seems to be some doubt about my power meter one concrete way to prove it would be if i can get my power supply to shut off right?
Edited by Blindsay - 8/10/11 at 5:52pm
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post #37 of 40
See, you've taken it to an extreme. The OP said nothing about watercooled maximum overclocked GPUs like yours, so 850-900W is still fine on an aircooled system- you can't really get the power cap +20% on air because your GPU will run way too hot on a aircooled system. For you, there is an obvious difference because you've taken the time and money to go all out on your overclocking.
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post #38 of 40
Quote:
Originally Posted by Blindsay View Post
650W for a CFX 6970 system
+75W for Hexacore Nehalems (i7 970)
+25W for Water cooling
+50W for both GPUs voltage tweaked
+100W for both GPUs power cap +20%

900W

"If Power Cap +20%, (HD6900 series only) then +50W per GPU"

even if you only had 2 on a 2600k system with air cooled gpu

650W for a CFX 6970 system
+50W for both GPUs voltage tweaked
+100W for both GPUs power cap +20%

800W

so im not sure how you can run a third on there on 850w?

edit: anyone have any idea what wattage would cause my AX850 to shut off? since there seems to be some doubt about my power meter one concrete way to prove it would be if i can get my power supply to shut off right?
Pretty sure you don't add in the extra wattage for the voltage tweak when you add in the power cap wattage, it's already there. The real issue in your calculations is that 2 6970s in crossfire at power cap draw ~140 more watts than a stock 6970s, then combine that with the 50w you added for voltage tweaking and you're +190w.
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post #39 of 40
Quote:
Originally Posted by FallenFaux View Post
Pretty sure you don't add in the extra wattage for the voltage tweak when you add in the power cap wattage, it's already there. The real issue in your calculations is that 2 6970s in crossfire at power cap draw ~140 more watts than a stock 6970s, then combine that with the 50w you added for voltage tweaking and you're +190w.
you do add the powercap wattage and the voltage wattage, they are 2 entirely different things

Quote:
Originally Posted by KittensMewMew View Post
See, you've taken it to an extreme. The OP said nothing about watercooled maximum overclocked GPUs like yours, so 850-900W is still fine on an aircooled system- you can't really get the power cap +20% on air because your GPU will run way too hot on a aircooled system. For you, there is an obvious difference because you've taken the time and money to go all out on your overclocking.
well the OP did ask "So lets say I do plan to unlock all three and make them over 20%, then what "

guess i just dont really consider mine "extreme" compared to some of the systems here haha
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post #40 of 40
1000w is more than enough for three 6950s. I had an ocz zx1000w power on three 6950s unlocked to 6970s. You can get away with a quality 850w unit like the HX850, but I would just get the 1kw for the extra headroom.
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