Dedicated PhysX card with GTX 770?

ekseli · Aug 7, 2013

In short, is it worth it and what would be a good choice for it?

Let's leave aside the number of games that do or don't support PhysX, I'm more interested in the performance gain of a dedicated PhysX card when the primary GPU is something in the GTX 760 - 770 - 780 range in games that do support PhysX. So, what is the cheapest nVidia GPU that would make sense as a dedicated PhysX card with one of those as the primary GPU?

Zac Lloyd-Jones · Aug 7, 2013

Very few games even use PhysX. Just use the GTX 770 on its own, its not like it can't handle the PhysX itself.

fkr · Aug 7, 2013

I have done a ton of reading and even after that I have not come to a great conclusion. i have read that if you use a second card that has an older memory interface it shows no improvement. so for the 760 i would use a gtx560 or something with that 256 bit interface. the people who seem to get a good setup going seem to get some good performance increase.

https://teksyndicate.com/forum/gpu/gtx-580-dedicated-physx-card-gts-450/130054

https://teksyndicate.com/forum/gpu/benchmarking-physx-gtx-780-gts-450/142528

http://hardforum.com/showthread.php?p=1038624099

http://hardforum.com/showthread.php?t=1645682

http://www.techpowerup.com/forums/showthread.php?t=186047

https://forums.station.sony.com/ps2/index.php?threads/dedicated-physx-cards.107490/

So i do not feel like trying to recall all of the old threads that I read before but it seems to help in some games. maybe metro if it does not offload to the CPU

ekseli · Aug 7, 2013

Zac Lloyd-Jones :

It's not about the GTX 770 being able to handle PhysX by itself, but about being able to have PhysX on in demanding games without a drop in FPS.

fkr · Aug 7, 2013

http://www.ninjalane.com/reviews/video/gtx-650ti_roundup/page7.aspx

I think it can be worth it I have read some weird things also where th dedicated card does not ramp up so setting a constant 3d profile can help with that also.

alright here is another good one
http://1pcent.com/?p=169

I swear there are so many variables in these tests. sometimes I think it is just different drivers that effect results

i do not know why but i always enjoy a best answer if i help

fkr · Aug 7, 2013

I also wanted to add to the naysayers that one of the best benefits from doing a dedicated card is an increase in the minimum fps when physx really gets going. If you have ever played at max settings in borderlands 2 with friends and you both play with the siren and her special ability phaselock gives all the elemental damages at once the screen is just insanely filled with physx effects and it can really drag on almost any card

fkr · Aug 7, 2013

http://www.evga.com/forums/tm.aspx?&m=1762273&mpage=1

http://www.evga.com/forums/tm.aspx?m=1768879&mpage=1

http://www.techpowerup.com/forums/showthread.php?t=135891

http://www.techpowerup.com/forums/showpost.php?p=2112682&postcount=27

http://www.evga.com/forums/tm.aspx?m=1817519&mpage=1

So it seems like you need enough cuda cores with the 560 being about the lowest i would trust then after that the clock speed really makes a difference. my old evga gtx 560 would OC to 1100 MHz until the drivers locked it at 1000MHz if you can get a good used one i would go that way otherwise maybe pick up a 650.

ekseli · Aug 7, 2013

Thanks for the input. I've tried to do some research myself too, but as you say there's a lot of conflicting reporting about it. So far it seems that a GTX 650 or 650 Ti would indeed be the best bet.

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