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Will my PSU handle a dedicated Physx card?

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October 12, 2012 3:09:56 AM

I recently acquired a Nvidia GTX 260 video card at a reasonable price with the intention of putting it to use as a dedicated PhysX card; however, I'm not sure if my PSU is up to the task of feeding another GPU (albeit, a dedicated PhysX card). My system is:

AMD Phenom II X2 555 Black Edition 3.8GHz
G.Skill DDR3 1600 4GB
XFX HD 6870 1GB
2 x SATA HDD
1 x IDE DVD drive
BFG 550w PSU (http://www.newegg.com/Product/Product.aspx?Item=N82E16817702010)

I bought the GTX 260 on the basis of adding some eye-candy to Borderlands 2 for less than the retail price of the game. However, in my excitement of getting a new toy, I completely forgot to consider my PSU before buying the GTX 260. I know for sure that my PSU isn't capable of running two 6870's or GTX 260's in CF or SLI, but I need to know if it will run the 6870 with the GTX 260 on full-time PhysX duty? I practically never use the DVD drive, so removing it from the system isn't a problem. I can manage with just one HDD, as well, if that will make any significant difference. I can also dial back the CPU OC if necessary.

Like I said, the GTX 260 was purchased on the basis of providing some cheap eye-candy but if its going to take a new PSU to make that happen, then the cheap aspect is out the window. I'll try to re-sell the GTX 260 before I spend more money on a new PSU and I certainly don't want to potentially overload and ruin a perfectly good PSU for naught, so I would much appreciate some experienced forethought from the forums. Thanks in advance!
a b ) Power supply
October 12, 2012 3:15:32 AM

It should run no problem, don't even need to remove anything. 6870s are low power and so is the 555.
a c 259 ) Power supply
October 12, 2012 4:23:04 AM

^ I disagree. The GTX 260 and the HD 6870 both need a recommended 500w power supply. What you have is an older budget model BFG that only produces 432 watts on the 12v rail. A modern high quality power supply with that rating would be labeled as a 450 watt unit. So to be honest you are close to the limits of that PSU with either of those cards by themselves. I would not risk it.
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a b ) Power supply
October 12, 2012 6:45:57 AM

The 555 is 95W, the 6870 is 150W, the 260 is 150W, this is max loaded power which will never happen if all its going to be used for is a physx card. Niether will the 6870 and the 555 reach that. If the power supply can really push those watts, it should work.
October 12, 2012 10:10:59 AM

anort3 said:
^ I disagree. The GTX 260 and the HD 6870 both need a recommended 500w power supply. What you have is an older budget model BFG that only produces 432 watts on the 12v rail. A modern high quality power supply with that rating would be labeled as a 450 watt unit. So to be honest you are close to the limits of that PSU with either of those cards by themselves. I would not risk it.


dual +12V rail, will run a gtx 260 just fine. No way will it draw that much power - i'm running an overclocked 480 on a 500w power supply and it works without a hitch. :D 
a c 259 ) Power supply
October 12, 2012 6:28:20 PM

As I said, it's fine for either card by itself. I would not try both at the same time though.

Quote:
dual +12V rail, will run a gtx 260 just fine



Dual 12v rail means absolutely nothing. Most multi rail configuration power supplies are not truely multi rail anyway. The power is produced by a single rail and split. Read this.

http://www.jonnyguru.com/forums/showthread.php?t=3990


Quote:
i'm running an overclocked 480 on a 500w power supply and it works without a hitch. :D 



Yeah, and you might get away with driving drunk 100 times in a row too but that does not make it a good idea :sarcastic:  . Don't ever stress test that setup or you might not have a computer any more. I hope that's a damn good 500w power supply.

System with a GTX 480 pulling 450 watts at load.

http://www.tomshardware.com/reviews/geforce-gtx-480,258...

HardOCP manages to pull 483 watts at the wall with a GTX 480.

http://www.hardocp.com/article/2010/03/26/nvidia_fermi_...

There is a reason a 600w PSU with 42a on the 12v rail is recommended for a GTX 480.
a b ) Power supply
October 12, 2012 8:01:20 PM

anort3 said:
As I said, it's fine for either card by itself. I would not try both at the same time though.

Quote:
dual +12V rail, will run a gtx 260 just fine



Dual 12v rail means absolutely nothing. Most multi rail configuration power supplies are not truely multi rail anyway. The power is produced by a single rail and split. Read this.

http://www.jonnyguru.com/forums/showthread.php?t=3990


Quote:
i'm running an overclocked 480 on a 500w power supply and it works without a hitch. :D 



Yeah, and you might get away with driving drunk 100 times in a row too but that does not make it a good idea :sarcastic:  . Don't ever stress test that setup or you might not have a computer any more. I hope that's a damn good 500w power supply.

System with a GTX 480 pulling 450 watts at load.

http://www.tomshardware.com/reviews/geforce-gtx-480,258...

HardOCP manages to pull 483 watts at the wall with a GTX 480.

http://www.hardocp.com/article/2010/03/26/nvidia_fermi_...

There is a reason a 600w PSU with 42a on the 12v rail is recommended for a GTX 480.
the simple fact that their system idle at close to 200w is already a hit that they aren't running a standard system. Also given the fact that they are measuring from the wall, there is at least a 20% lower number coming out of the psu. Just because you are going to load a 480 and your system with benchmark doesn't mean the power consumption is anywhere near that with normal use. a physx card doesn't pull nearly as much as a fully loaded card running a stress test.
a c 243 ) Power supply
October 12, 2012 10:17:33 PM

anort3 said:
I would not try both at the same time though.

I would, just to see how long it would take to make it go pop though, not if I wanted it to last
Couple of points;
It's a Huntkey
It's peak rated, at 25c
a c 259 ) Power supply
October 12, 2012 10:32:53 PM

The only bad thing about that idea is when it does go pop, does it go pop by itself or does it take other stuff with it. ;) 
a c 243 ) Power supply
October 12, 2012 10:35:41 PM

anort3 said:
The only bad thing about that idea is when it does go pop, does it go pop by itself or does it take other stuff with it. ;) 

Haven't had that happen yet, but I do it on a system that I'm not worried about in case one does ;) 
!