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Thinking about lowering the power supply unit

post #1 of 6
Thread Starter 
I have a GTX 460 super clocked and thinking about taking out my 1000w power supply for something lower, but I also plan on buying another EVGA GTX 460 super clocked to SLI together and a ups of course to protect my computer.

http://www.newegg.com/Product/Produc...wer-_-42102048

My question is, if or when I purchase my second EVGA GTX 460 will I need my 1000w power supply or will it be safe for me to swap it to a lower watt power supply when SLIing the cards.
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post #2 of 6
What is the reasoning you're wanting to buy a lower power psu? By the time you sell your old one and buy a new one, I doubt you'll end up saving much money. To answer your question though, you can easily SLI GTX460 with something much less powerful.
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post #3 of 6
You don't need any more that a good 650w to run overclocked 460s.
The only reason I have this 850w is that I wanted to go modular, and it was a struggle to find 650s with enough PCI-E cables to run a pair of 460s, and it was a tiny amount to go from the 750w to 850w....

If you can find a good looking 650w with the right cables, go for it. If not, then look for a good 750w unit. No way would you really need more than that.
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post #4 of 6
Thread Starter 
I want to use a UPS and looking at 1000 watts and trying to use it on a 900 watt ups might not work, there is also the light bill going up (especially in the winter) thought one of the many ways of bring it down by some what would be to get a lower power supply unit. And I realized 1000 watts is a bit of an over kill.
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post #5 of 6
You could run your rig fine as is on a 900w UPS, with the HX1000. The power supply will be drawing no more than 800w (from the wall/UPS) or so tops with a pair of 460s in SLI.


Remember that a UPS is rated in AC watts, which is the same figure that the PSU will draw from the wall, which is bigger than the PSU's rating. 650w divided by 0.8 (for 80% efficiency as a base figure, I know the HX is better) gives a from the wall figure of 812w. Up the efficiency to 80+ silver (more in line with the HX) and you're now needing no more than 770w from the wall.

The 900w UPS will be able to do that without trouble, but you may not have the power to run your display at the same time if you're really pushing the power draw at the time the power goes out.

My advice? Don't change the PSU, and get the 1Kw UPS instead of the 900w. That will have the power to keep your rig running through a blackout with the screen on as well.
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post #6 of 6
Thread Starter 
Quote:
Originally Posted by allikat View Post
You could run your rig fine as is on a 900w UPS, with the HX1000. The power supply will be drawing no more than 800w (from the wall/UPS) or so tops with a pair of 460s in SLI.


Remember that a UPS is rated in AC watts, which is the same figure that the PSU will draw from the wall, which is bigger than the PSU's rating. 650w divided by 0.8 (for 80% efficiency as a base figure, I know the HX is better) gives a from the wall figure of 812w. Up the efficiency to 80+ silver (more in line with the HX) and you're now needing no more than 770w from the wall.

The 900w UPS will be able to do that without trouble, but you may not have the power to run your display at the same time if you're really pushing the power draw at the time the power goes out.

My advice? Don't change the PSU, and get the 1Kw UPS instead of the 900w. That will have the power to keep your rig running through a blackout with the screen on as well.
Good to know that my current supply won't draw the complete 1000 watts, and I did some price checking on 1kw UPS and the price on those aren't friendly. They run 300 and up. I will keep checking.
First Build
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CPUMotherboardGraphicsRAM
Intel Core i7 920 D0 141-BL-E760-A1 EVGA Geforce GTX 460 1gb SC CORSAIR CMG6GX3M3A2000C8 6GB (3 x 2GB) PC3-16000 
Hard DriveOptical DriveOSMonitor
Western Digital Caviar Green 640 Black Caviar 1tb SAMSUNG Black 22X DVD+R 8X DVD+RW 22X DVD-R 16X DV Windows 7 Ultimate 64-bit Acer H233H 
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CORSAIR CMPSU-1000HX ATX12V 2.2 HAF 932 
  hide details  
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First Build
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 920 D0 141-BL-E760-A1 EVGA Geforce GTX 460 1gb SC CORSAIR CMG6GX3M3A2000C8 6GB (3 x 2GB) PC3-16000 
Hard DriveOptical DriveOSMonitor
Western Digital Caviar Green 640 Black Caviar 1tb SAMSUNG Black 22X DVD+R 8X DVD+RW 22X DVD-R 16X DV Windows 7 Ultimate 64-bit Acer H233H 
PowerCase
CORSAIR CMPSU-1000HX ATX12V 2.2 HAF 932 
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