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Would a 9800GT Dedicated for Physx bottleneck a GTX 660? - Page 2

post #11 of 26
Thread Starter 
Well, i would agree that a GTX680 would be better off without the 9800GT but the question is will the GTX660 Be?

Im still waiting for my GTX660 so i cant really check if it is better off alone or not.

On another note, Do you guys think that the 660 reference design compared to some GIGABYTE Designs is good? How much better the GB board is? Considering that i wont be doing any overclock anytime soon..
post #12 of 26
Quote:
Originally Posted by enkm View Post

Well, i would agree that a GTX680 would be better off without the 9800GT but the question is will the GTX660 Be?

Im still waiting for my GTX660 so i cant really check if it is better off alone or not.

On another note, Do you guys think that the 660 reference design compared to some GIGABYTE Designs is good? How much better the GB board is? Considering that i wont be doing any overclock anytime soon..
If you aren't overclocking Reference will do fine, just louder.
Also the 660 is what 5-6 generations ahead of the 9800GT? I'm sure it will do fine thumb.gif
post #13 of 26
Thread Starter 
Cool thanks,

im starting to really like this forum. rolleyes.gif
post #14 of 26
Quote:
Originally Posted by enkm View Post

Cool thanks,

im starting to really like this forum. rolleyes.gif

You will learn more and more as each day passes. thumb.gif
post #15 of 26
Thread Starter 
Well guys, thanks for helping me out, but i have done some research on the subject and i think we need to revive this discussion.

What i found out based on those videos:
http://www.youtube.com/watch?v=cbww3dhzK0M
http://www.youtube.com/watch?v=PQu55bciMt4
(Credit to Linus Tech Tips)

Is that the GTS 450 is basically the optimal physx card at the moment.
Now comparing the 9800GT to the GTS450 i found that they are not so far apart in mathematical performance,
Okay now before you execute me for such words i got math to prove my point.

Physx calculations are basically math right? And can be somewhat measured under Floating point performance...
Based on pure Gflop/s performance the 9800GT Delieveres about 500Gflop/s, and the GTS450 putting out something around 600.

On the other side, In terms of cuda cores... The GTS450 has 192 of them running at 1566MHz, The 9800GT has 112 of them running that a similiar 1500MHz.

Seeing how the guy in the video ran a GTX580 and looking at reviews that say that GTX660 is a bit behind the 580, we can conclude that the physx performance gap between the GTS450 and the 9800GT will be about the same as the graphics performance between the GTX660 and the GTX580, so the 9800GT wont be a bottleneck for the 660.

I would really appreciate a pro to expand on the subject and create a refference topic for everyone who searches for information on the subject.

Now... The aftermath.... medieval.gif
post #16 of 26
I would say to try it, but there's one key thing that peoplehhaven't mentioned: overclocking.
PhysX performance is entirely dependent upon the core/shader clocks and has no need for fast memory. I would suggest that you overclock the core/shaders as high as possible, and even lower the memory clock as much as needed to maximize the core clock. The difference between a stock card and a solid 20 percent OC can be significant when it comes to PhysX performance.

Of course, the biggest issue is CUDA Cores. The more, the better. Ideally you want to have 1/3rd as many as your primary card, but that's the ideal.

Also, the best generations for PhysX are the G92, 4xx, and 5xx as they have the strongest compute performance. The 2xx cards are relatively weak in that area. For example, I have tried to use a 280 and it was outperformed by a 550Ti despite the former being a "more powerful" card.
   
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post #17 of 26
I've heard from a person I trust to know what he's talking about (not saying he's an expert) that the texture fill rate is the important number for physX calculations, you can find this info on the geforce specs page of the card in question so you can compare it to others.

I heard this back in the 500 series when the 560ti had a higher texture fill rate than even the 580 making it a better PhysX card.
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post #18 of 26
Thread Starter 
Well that is quite good news since the 9800GT is about 34% faster at texel rate than the GTS450.

ph34r-smiley.gif
post #19 of 26
Quote:
Originally Posted by Lord Xeb View Post

When I was running Physx with my 8800GTX along side my GTX 680, it caused issues.

Why would ever try to pair those together?! The 8800GTX pulls as much power, almost, as a 680! tongue.gif Silly Xeb...
     
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post #20 of 26
Quote:
Originally Posted by nleksan View Post

Of course, the biggest issue is CUDA Cores. The more, the better. Ideally you want to have 1/3rd as many as your primary card, but that's the ideal.
DING DING DING!

we have a winner!

though i may not agree that core speed will make a difference since i tried overclocking my 550ti and didn't get any better result. HOWEVER i am limited to how far i can OC it since the 297.xx drivers and later throttle it when i try to get past 1Gz (the evga SOC i have is 981Mhz already so i doubt 19Mhz will make a difference) considering i haven't seen more than 30% of the 550ti used i would think that if there were more physX needed it would use more cores as opposed to using the 30% but just faster. - but that just my thoughts.

a few months ago i was trying to help someone determine if using a physX card would help with a SLI setup and found this thread:
680 + physx bench
i found it helpful because they used several different setups in different games and i concluded: BIG QUOTE! no sense in taking up too much room, eh? (Click to show)
Quote:
Originally Posted by looniam View Post

i doubt you made a mistake; here is a post on hardfourms with someone benching a 680 GTX SLI 560 Physx setup.
Quote:
680 SLI Batman Arkham City 2560x1440 DX11 Max + 32x CSAA
MIN=25
MAX=90
AVG=60

680 SLI + 560 Physx card Batman Arkham City 2560x1440 DX11 Max + 32x CSAA
MIN=33
MAX=105
AVG=71

680 SLI Mafia 2 2560x1440 DX9 Max + AA on + Custom FXAA
AVG=63.3 Rank B Driver 301.25

680 SLI + 560 Physx card Mafia 2 2560x1440 DX9 Max + AA on + Custom FXAA
AVG=88.2 Rank A HAd to use Driver 301.42, 301.25 crashed with Physx
looks like there was some benefit with a stronger SLI setup with a weaker physx card. after doing a bit of looking around the last few months it appears that if the physx card has ~20% cuda cores as the total cuda core count as the SLI setup, it has benefit.

ie. GTX 670 SLI (1344*2) 2688 cuda cores and the 650ti has 768 or about 28%.

this is a good post, though it is about hyprid SLI (using physX with an AMD card) still has some pretty good observations.
My experiences with Hybrid PhysX

there are A LOT of good, but more bad, deicated physX card discussions and benchmarks if you have the time to google and wade through them.

hope this helps. thumb.gif

edited for typos, sorry if i missed any tongue.gif
Edited by looniam - 5/19/13 at 3:28pm
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