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PSU for Dual 4870x2 - Page 9

post #81 of 109
Quote:
Originally Posted by LOL_Wut_Axel View Post
He over-volted the GPUs, which not many people do. That, and he has TONS of peripherals. Of course, this video doesn't prove anything either. A Core i7 rig with a decent OC + Radeon HD 6970 CrossFire should pull 650W. 600W if no over-volts. I already made my statement and I stand by it: you do not need an 850W PSU for a Radeon HD 6970 CrossFire rig. At full load, they pull 400-450 watts from the wall. He's getting almost 2x that, and I doubt a Core i7 can pull 350W from the wall at that voltage. That means other components are pulling a lot of power, too (what I said about peripherals).
If you think about it 1 card can max pull (via the cables) 300w, 2 should pull like 450-475. Then add on 250w for CPU, 700w, add 50w for the peripherals and you get ~750w. Watercooling would add a bit more as well.
But then realistically you shouldn't close to that. So with everything you should be getting like 720w. Wait, is he not getting close to that?
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post #82 of 109
Quote:
Originally Posted by thealex132 View Post
If you think about it 1 card can max pull (via the cables) 300w, 2 should pull like 450-475. Then add on 250w for CPU, 700w, add 50w for the peripherals and you get ~750w. Watercooling would add a bit more as well.
But then realistically you shouldn't close to that. So with everything you should be getting like 720w. Wait, is he not getting close to that?
Yeah, no... a 6970 pulls around 250W at max load, and two pull 400-450W. A Core i7 at that voltage does pull around 250W. Assuming worst case scenario, that's 700W at the wall. Assuming best, 650W. Add 50W for peripherals, and you get 700-750W. He's pulling 830W, which is obviously much higher. At a more normal 700W-750W, assuming 85% efficiency, that's 600-640W that the PSU needs to deliver. How, then, would you NEED an 850W PSU as the minimum, which is what he said?
    
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post #83 of 109
Quote:
Originally Posted by LOL_Wut_Axel View Post
Yeah, no... a 6970 pulls around 250W at max load, and two pull 400-450W. A Core i7 at that voltage does pull around 250W. Assuming worst case scenario, that's 700W at the wall. Assuming best, 650W. Add 50W for peripherals, and you get 700-750W. He's pulling 830W, which is obviously much higher. At a more normal 700W-750W, assuming 85% efficiency, that's 600-640W that the PSU needs to deliver. How, then, would you NEED an 850W PSU as the minimum, which is what he said?
Nononono you see I mean maximum possible (overclocked etc) would be like 300w, together 450-500w. The CPU 250w (700-750) then add peripherals, (750-800w) Thats all direct consumption of the product, so efficiency is not needed to be factored into it. Efficiency only matters when watts pulled from wall converting that into actual watts consumed by the products.

All of the above things are rather over-exaggerated though, (GPU/CPU) so while I do think 830 from the wall (747w consumption watts from the products) is unlikley, its not impossible, especially with the watercooling kit and overvoltage on his GPU's
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post #84 of 109
Quote:
Originally Posted by LOL_Wut_Axel View Post
He over-volted the GPUs, which not many people do.
I hope to god you're joking with that comment.

GPU over-volting is just as common as CPU over-volting these days.

I don't know anyone who has a GPU with software voltage control that doesn't use it.

Heck if you do a search on these forums you'll find people COMPLAINING that there card doesn't support software over-volting.
post #85 of 109
Quote:
Originally Posted by thealex132 View Post
Nononono you see I mean maximum possible (overclocked etc) would be like 300w, together 450-500w. The CPU 250w (700-750) then add peripherals, (750-800w) Thats all direct consumption of the product, so efficiency is not needed to be factored into it. Efficiency only matters when watts pulled from wall converting that into actual watts consumed by the products.

All of the above things are rather over-exaggerated though, (GPU/CPU) so while I do think 830 from the wall (747w consumption watts from the products) is unlikley, its not impossible, especially with the watercooling kit and overvoltage on his GPU's
Ok, yes. But you can't use his experience as a guide, though, because not many enthusiasts overvolt their GPU and have that many peripherals, but they do overvolt their CPUs. Most enthusiasts don't water-cool, either. Over-volting the GPUs probably accounts for that >50W difference. The watts I was referring to as being consumed were at the wall. This is what reviewers test for, so efficiency does have to be taken into account. His meter is providing data for the consumption at the wall, too.
    
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post #86 of 109
Quote:
Originally Posted by scatteh316 View Post
I hope to god you're joking with that comment.

GPU over-volting is just as common as CPU over-volting these days.

I don't know anyone who has a GPU with software voltage control that doesn't use it.

Heck if you do a search on these forums you'll find people COMPLAINING that there card doesn't support software over-volting.
No, it's not. Just because some people do it, doesn't mean all do. There are MANY more enthusiasts that over-volt CPUs rather than GPUs.

Then again, if you do account for the niche part of enthusiasts that do over-volt their GPUs, and assume 50W higher power consumption because of it, it's at 800W now. And again, given an efficiency of 85%, that's 680W the PSU is being asked to provide. Again, even in an extreme situation like this you wouldn't NEED an 850W PSU. He said that just running a Radeon HD 6970 CrossFire would require it, and a more normal setup would likely be pulling 700-750W from the wall, thus requiring 595-640W from the PSU. You wouldn't NEED an 850W PSU to run it.
Edited by LOL_Wut_Axel - 4/18/11 at 1:27pm
    
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post #87 of 109
I would say hardcore overclocking enthusiasts overvolt their GPU's 24/7 the rest of us basically slightly overclock if at all. I can't overvolt at all on my GPU due to no VRM cooling/VRAM Cooling, but before I just left it at stock anyway. My CPU I have actually undervolted but got a higher overclock
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post #88 of 109
Quote:
Originally Posted by SyncMaster753 View Post
@blindsay

What do you have plugged into that power meter?

Is it JUST your tower? or does it run your WC Loop/Monitor/Speakers/ETC
just the tower itself, but all my water cooling stuff is internal so of course that includes my water pump

Quote:
Originally Posted by LOL_Wut_Axel View Post
He over-volted the GPUs, which not many people do. That, and he has TONS of peripherals. Of course, this video doesn't prove anything either. A Core i7 rig with a decent OC + Radeon HD 6970 CrossFire should pull 650W. 600W if no over-volts. I already made my statement and I stand by it: you do not need an 850W PSU for a Radeon HD 6970 CrossFire rig. At full load, they pull 400-450 watts from the wall. He's getting almost 2x that, and I doubt a Core i7 can pull 350W from the wall at that voltage. That means other components are pulling a lot of power, too (what I said about peripherals).
Tons of peripherals? i dont think i have THAT many. Also things like my hard drives are not really dont much when running furmark and what not. I even gave you IDLE, CPU Load, and CPU + GPU Load. And i even stated what my load draw was without the cards being overvolted. Also overvolting is fairly common on this site.

I dont get how you can still doubt the draw of my system, 2 different meters are showing it?

Sorry about the f-bomb in the video, i just dont appreciate being called a liar....

edit: oh and if you were referring to the efficency of my power supply its ~90% not 80 or 85
that and while my computer may bit a bit out of the norm for a normal person, it is a very reasonable machine for this site
Edited by Blindsay - 4/18/11 at 1:47pm
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post #89 of 109
Ok, 4870 x2 quadfire should be fine with my seasonic 850 watts PSU? thanks guys.
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post #90 of 109
Quote:
Originally Posted by Blindsay View Post
just the tower itself, but all my water cooling stuff is internal so of course that includes my water pump



Tons of peripherals? i dont think i have THAT many. Also things like my hard drives are not really dont much when running furmark and what not. I even gave you IDLE, CPU Load, and CPU + GPU Load. And i even stated what my load draw was without the cards being overvolted. Also overvolting is fairly common on this site.

I dont get how you can still doubt the draw of my system, 2 different meters are showing it?

Sorry about the f-bomb in the video, i just dont appreciate being called a liar....

edit: oh and if you were referring to the efficency of my power supply its ~90% not 80 or 85
Doesn't change anything. You used your system as a way of describing what the average enthusiast will consume, but the truth is your system will consume 50-100 watts more. Also, your PSU is 90% efficient at 50% load. In the scenario you posted, it'd be 86-87% efficient due to 75-80% load. But that's just some minor things to point out. The point I want to make is that you're lying when you say you need an 850W PSU to run a system with a Radeon HD 6970 CrossFire. The only instance in which it'd make sense is if you do hardcore CPU and GPU over-clocking and over-volting, plus a generous amount of peripherals. Funny this is, that's what describes your build the most. Just because YOU MAY need an 850W PSU or higher to run a 6970 CrossFire doesn't mean everyone will. You can run it on a stock platform and consume 600 watts at the wall. Throw in CPU over-clocking and over-volting plus GPU over-clocking, and then it's 700-750W. Throw in an even more extreme system and then it's 800W. Even if we take into account 87% efficiency and 830 watts at the wall, that's 720W the PSU has to provide. In a more realistic average enthusiast scenario, that'd be ~650W, which is not much to ask for a 750W PSU that's high-quality.

And then there's the fact that this is absolute maximum power draw. Gaming, those 650W would turn into 550W or so.

Sorry man, but you're just wrong. You don't need 850W to power a Radeon HD 6970 CrossFire system.
    
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Core 2 Duo P7450 @2.7GHz Pegatron G60VX (A12) GeForce GTX 260M 1GB @610/1500/2000 Hynix 4GB DDR2 @1000MHz 
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Seagate Momentus 7200.4 320GB LG GSA-T50N, HP dvd1170r Windows 7 Home Premium 64-bit HP W2207 22" (1680x1050) 
KeyboardPowerMouse
Microsoft Digital media Keyboard 3000 Delta Electronics ADP-120ZB BB 120W Logitech G500 
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