Tom's Hardware > Forum > Graphic & Displays > Graphics Cards > 620W Enough For GTX 260?
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Sohaib   05-30-2009 at 08:09:58 PM

I am running BFG GTX 260 Maxcore and i was thinking lately to do an SLI setup but i just realized that maybe my PSU might not be up for the task. I have Corsair HX620W PSU and i am also running 4 HDD's (2 WD Caviar Black 1TB), 3 optical drives & Q6600 at stock speed.

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rewindlabs   05-30-2009 at 08:34:41 PM
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Did you search at all.....maybe you could try googling your psu...and maybe type something like this "gtx 260 sli HX620"

 

.....i know the answer do you?


Message edited by rewindlabs on 05-30-2009 at 08:34:44 PM
------------------------------ http://i151.photobucket.com/albums/s145/RSSRM/ay14s5-1.jpg
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BlueScreenDeath   05-30-2009 at 08:51:29 PM
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Not enough. Not nearly enough. For something like your rig, you need a minimum of quality 750watt to 800watt.

------------------------------ i7 920, E5300
GTX260, HD4870, HD4830
 Reply to BlueScreenDeath
Gin Fushicho   05-31-2009 at 01:14:21 AM
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Just spend the 10-15 extra dollars and get Corsairs 750Watt.

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Sohaib   05-31-2009 at 10:03:22 AM
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@rewindlabs
I did a lot more research then you can even think of and that forced me to ask. You know what? NVIDIA says Minimum 500 or 550W PSU is needed for single GTX 260 while i have read people saying that GTX260 uses only 150-180W under full load and i read ppl saying they are running GTX260 on 400-450W PSU's. Now i know XFX says 750W minimum for GTX260 SLI but they also say 550W for single so i thought its just a felony and i may run it on 620W.

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rewindlabs   05-31-2009 at 10:05:15 AM
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Sohaib wrote :

@rewindlabs
I did a lot more research then you can even think of and that forced me to ask. You know what? NVIDIA says Minimum 500 or 550W PSU is needed for single GTX 260 while i have read people saying that GTX260 uses only 150-180W under full load and i read ppl saying they are running GTX260 on 400-450W PSU's. Now i know XFX says 750W minimum for GTX260 SLI but they also say 550W for single so i thought its just a felony and i may run it on 620W.


Yeahp i did the exact same research before i bought mine....

------------------------------ http://i151.photobucket.com/albums/s145/RSSRM/ay14s5-1.jpg
 Reply to rewindlabs
chripuck   05-31-2009 at 06:40:31 PM
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Sohaib wrote :

I am running BFG GTX 260 Maxcore and i was thinking lately to do an SLI setup but i just realized that maybe my PSU might not be up for the task. I have Corsair HX620W PSU and i am also running 4 HDD's (2 WD Caviar Black 1TB), 3 optical drives & Q6600 at stock speed.



For a minute I thought you were going to ask if 620 watts was enough to power a single GTX 260 and I was going to laugh and tell you yes. Taking SLI into consideration I'd say that's a no. Your system would boot, but at full load it would peak somewhere around 630 watts.

I came up with that number assuming you had two sticks of DDR2 and 4 120mm fans cooling your system using the following tool: http://extreme.outervision.com/PSUEngine

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Shadow703793   05-31-2009 at 07:25:06 PM
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@OP: Understand that selecting a PSU based on Wattage is probably one of the worst/incorrect ways to choose a PSU.

W = A*V
For W = Watts, V= Voltage, A = Amps

So, since a GTX260 draws about 160-180W, we can see that for the +12 rail we need an absolute minimum of 15A (180/12). Put in the rest of the hardware and we need about 30A on the +12. Since you are using an SLI set up you will need ~60A (safe estimate, a bit overkill may be). The 620HX only has 54A. So in theory you shouldn't run a GTX 260 SLI on the 620HX.

My recommendation goes to the 750TX or the PC Power & Cooling 750. Both have 60A on the +12 rail.

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Sohaib   05-31-2009 at 08:08:35 PM
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chripuck wrote :

For a minute I thought you were going to ask if 620 watts was enough to power a single GTX 260 and I was going to laugh and tell you yes. Taking SLI into consideration I'd say that's a no. Your system would boot, but at full load it would peak somewhere around 630 watts.

I came up with that number assuming you had two sticks of DDR2 and 4 120mm fans cooling your system using the following tool: http://extreme.outervision.com/PSUEngine



Haha, that was a mistake in thread title, i also realized it after i posted it but unfortunately we can't edit titles. :pfff:
Yes, i do have 2 DDR2 sticks but you are wrong at guessing Fans. MY Cooler Master HAF 932 casing actually have 3 230mm fans and 1 140mm.
I have made up my mind for getting Corsair HX850W PSU first. Thanks everyone for suggestions.

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