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post #11 of 22
Oh my, i am quite surprised. I havent ran the game yet but I did run fluid mark with both cards @ x8 and got a score of 4822 which is far superior to my previous best of 4112. I really thought x8 was hurting me lol. Thats a physics bench though so let me run Borderlands 2 and see what i average there.
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post #12 of 22
Ok so I tested Borderlands with 3 configurations on the cards. As follows:

Single GTX680 @x16gen3


Avg: 67.167 - Min: 39 - Max: 105

GTX680 w/ GTX560 @x8/x8

Avg: 71.572 - Min: 19 - Max: 187

GTX680 w/ GTX560 @x16/x4

Avg: 66.758 - Min: 14 - Max: 91

So Strangely enough it seems that to fully benefit from my dedicated physx I need to have my cards x8/x8 which leads me to theorize that for best results you need your bus speeds to match when pairing up for physx.

If I had the money I would buy a mobo cabable of x16/x16 simply to test that theory. Maybe someone here has one and would be willing to bench?
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post #13 of 22
You have a lower minimum FPS, meaning it wouldn't be as smooth as possible.

Stay with the 680
post #14 of 22
I wouldnt bother with a dedicated Physx card, Linustechtips on youtube did a video on this a while back and showed that in some circumstances it can actually hinder performance, I have an EVGA GTX 680 SC + and i run Borderlands 2 with everything at max and it never dips below 60fps, I've even seen it skyrocket to 200 in certain areas.
post #15 of 22
Yea I definately am bit disapointed. I guess that with a video game since there is so much more going on you cant really benefit from a dedicated card outside of a simple physx benchmark. I.E. Fluidmark score skyrocketed and the FPS in game suffered overall. I guess I cant really complain though, at least I know now. I did a crap load of searching the net about this to figure out what the best configuration would be but now that I buckled down (got off my lazy ass) and tested myself I have no doubts. The plus side, ill use less power with just 1 card, the downside, my rig wont look as beefy with just the single card :-P

To the OP, I hope this helps you figure out your dilema. According to my little run a single GTX 680 is plenty for physx in a game environment.

Cheers everyone thumb.gif
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post #16 of 22
Well, guess this puts the nail in the coffin for a dedicated physx card. those min frames just fall like a rock. Unless you were using two 670s or two 680s, but maybe not even than.
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post #17 of 22
Quote:
Originally Posted by Rickles View Post

Well, guess this puts the nail in the coffin for a dedicated physx card. those min frames just fall like a rock. Unless you were using two 670s or two 680s, but maybe not even than.

I would not put that much stock into a MIN FPS rate alone. When doing comparisons like this, it's best to see a graph comparing performance over time like they do in the [H]ardOCP gpu reviews. An improvement of 4.5fps average might actually 'outweigh' the drop in the MIN, but it may not. It's COULD just be one single frame that's going out really slowly when running the dedicated card. Seeing the graph of the performance would be much more illustrative.

Stealth, I take it you got those numbers from a runs using FRAPS, right? Did you have it log the FPS over time? You might want to consider throwing the numbers up on a graph using excel or the like. You might find that overall during the course of the run, the physX card does help out pretty nicely. Or not ... never know til you check.

If you're not sure what I mean, check out the graphs I did on this thread or this thread or this thread
    
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post #18 of 22
The benchmark for Batman is in the Options menu.
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post #19 of 22
Actually you make a very valid point. I did use FRAPS and for 240second runs. The only problem is that the log doesnt show how many frames the lowest FPS ran for. I could have ran around 30 for the majority of the lows and simply had a few frames drop to 17 or whatever, What would be nice to have in FRAPS is for the log to show your highest average and lowest average FPS as well. This way the possible single frame drop to single digits doesnt effect the overall concensus of these tests.

If you know of a way for me to log my LOWEST average I am more than willing to run all these tests again, and for a longer time frame than 240s if you all think it would help draw a more solid conclusion.

Let me know what I might be able to do and if you would like me to run more tests
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post #20 of 22
Hey guys,

I'm running a EVGA GTX690: EVGA GTX680(dedicated physix): EVGA X79 SLI: 3930k @4.2ghz: G.Skill RipJawsZ 16GB 2400mhz

The 690 is running a gen3x16 on each GPU and the 680 dedicated physx is running @ x16 and only using 1.1 as it doesnt need more memory bandwith to run as a dedicated physx card.

I'm truly stoked with this configuration. I can see a huge performance increase in Borderlands2, batman AK, and BF3.
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