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GTX 780Ti with GTX 650 PhysX PSU

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December 11, 2013 6:24:10 PM

Hello!
Will my Seasonic G Series 650W with 54A be able to power a custom watercooled PC with a GTX780Ti, GTX 650 (for PhysX) and a 4770k ?

Also, is there any overclocking room?

Thank you for your help
December 11, 2013 6:30:59 PM

It should be able to, however, PhysX cards are hardly necessary and can even hold back the performance of the main GPU. As for overclocking room, it depends on how much voltage your card wants.
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a c 266 ) Power supply
a c 92 Î Nvidia
a c 262 U Graphics card
December 11, 2013 7:09:47 PM

I'm not sure I would try it. The system with just the GTX 780 Ti needs a recommended 620 watts.

http://www.realhardtechx.com/index_archivos/Page362.htm

The 650 Ti will never use full power as a PhysX card but I think you are cutting it pretty close even though the Seasonic G is a very good unit. I am using a GTX 780 Superclocked with a GTX 460 1Gb as a PhysX card but I have only had the setup less than a week so I have not had the chance to do much testing yet. I'm using a Corsair 750TX power supply and I have no doubt that's enough. My GTX 460 will use more power than your 650 Ti but my 780 will use less than your 780 Ti so I suspect our power requirements are very similar.
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December 11, 2013 7:10:44 PM

SubinP said:
It should be able to, however, PhysX cards are hardly necessary and can even hold back the performance of the main GPU. As for overclocking room, it depends on how much voltage your card wants.


is it possible that when a game saturates the compute power of the PhysX dedicated card, it'll automatically utilize the main GPU's compute power? Sort of like sharing the cuda cores
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December 11, 2013 7:45:28 PM

anort3 said:
I'm not sure I would try it. The system with just the GTX 780 Ti needs a recommended 620 watts.

http://www.realhardtechx.com/index_archivos/Page362.htm

The 650 Ti will never use full power as a PhysX card but I think you are cutting it pretty close even though the Seasonic G is a very good unit. I am using a GTX 780 Superclocked with a GTX 460 1Gb as a PhysX card but I have only had the setup less than a week so I have not had the chance to do much testing yet. I'm using a Corsair 750TX power supply and I have no doubt that's enough. My GTX 460 will use more power than your 650 Ti but my 780 will use less than your 780 Ti so I suspect our power requirements are very similar.


My card is a GTX 650 non-Ti. Since the 650 has 384 Cuda Cores and that PhysX relies solely on compute power, I thought it would be plenty for PhysX use. In what way will it ever hold back performance?
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a c 266 ) Power supply
a c 92 Î Nvidia
a c 262 U Graphics card
December 11, 2013 8:37:21 PM

Yeah it's plenty of card for PhysX maybe even more than you need like my GTX 460. PhysX cards never pull full power but you are already really close to the wattage you need for the 780 Ti. I'm just not sure how much power the 650 will pull. I would feel better if you had a 700-750w power supply for both cards.

I'm not sure a PhysX card will hurt performance ever unless the card is to weak to serve the purpose. I would like to see sources citing that and what the hardware used was.
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December 12, 2013 3:13:18 AM

If your BIOS modding, over-volting and playing around with PT a single GTX 780 TI can eats as much as 572 watts no joke the card is a monster.
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