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Would a 9800GT Dedicated for Physx bottleneck a GTX 660? - Page 3

post #21 of 26
Thread Starter 
Hey guys, i found a good source for physx performance reference:

Link

Now, about the hybrid Physx experementation, This was the bomb my friend, I really learned allot on the subject just from that post alone.
Thank you very much for posting this, i hope other people on the internet will be fortunate enough to stumble upon this thread and get their questions answered.

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post #22 of 26
http://www.youtube.com/watch?v=cbww3dhzK0M
Having an old card for PhysX usually doesn't help; the main card does PhysX and the main workload by itself better.
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post #23 of 26
Quote:
Originally Posted by Sethris225 View Post

http://www.youtube.com/watch?v=cbww3dhzK0M
Having an old card for PhysX usually doesn't help; the main card does PhysX and the main workload by itself better.

keep in mind the 8600 has 32 cuda cores, the 550ti has 192, 560ti has 384 and the 580 has 512.

i would have like to seen a 8800 with 96(gs), 122(gt), 128(gts) cuda cores between the three cards..
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post #24 of 26
Running Hawken, with Physx set to high, my 465 is running at its default clocks... increasing it doesn't seem to do anything but draw more power. I was always under the impression that OCing a physx card was nearly pointless.

At any rate, I am using a 448 core 465 with my Titan, which has... 2,688. Exactly 6 times as many cores, and while I haven't done any testing on the matter, I haven't noticed any problems with the setup. Perhaps I might be losing a little performance on the Titan, but if so... I can't tell at all.

I don't know that shelling out to find a card with nearly 1k cuda cores would be worth doing so lol
Edited by Masta Squidge - 5/20/13 at 4:45pm
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post #25 of 26
The CUDA Cores can't be directly compared between different architectures. For example, Kepler are phenomenal gamingbbut terrible compute cards relative to Fermi, which are able to do much more compute per core. I should have elaborated on this in my prior post about the ratio of CUDA Cores.

The reason that the core overclocks help is because they are tied to the shader clocks. Overclocking a 550Ti may not provide much benefit because it's already more than capable of handling the workload, but the benefits are seen when you have an older card that is just on the cusp of being a good PhysX card.
   
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post #26 of 26
thats interesting about the differences in computer performance. it seems likely though what or how much difference would that make? if i am not mistaken physX is a different compute performance than others.

i ran across this when looking around about core park (of all things):
Dedicated PhysX PPU / GPU for Borderlands 2: EVGA GTX 580 SC versus EVGA GT 640

at first the 580 made a decent performance improvement over the 640 but after extended benching the 640 was actually better.
Quote:
In the extended benchmarks, the GTX 580 SC gave a 20% FPS performance boost to the GTX 680. The GT 640 gave a 24% FPS performance boost to the GTX 680. Interesting…so what is happening here? Well, I did simply play extended sessions – meaning the uniformity of these tests is suspect. However, this does give you an indication that the GT 640 is not that far off from the GTX 580 SC performance-wise when used as a dedicated PhysX processor!
though the 640 is clocked 100Mhz, if we entertain that core speed does make a difference, it has 75% of the cuda core of the 580 (384/512).btw, just a mention of the main gaming card was a 680 with 1536 cores.

btw, it seems this cat loves the 640 for a PPU . . .
Dedicated PhysX PPU / GPU for Borderlands 2: EVGA GTX 690 with EVGA GT 640


and the mother of all PPU shoot outs (for kepler)
Dedicated PhyX PPU / GPU Shoot Out: GT 640, GTX 650, GTX 650 Ti, and GTX 680 – paired with a GTX 690.


- just chatting here and sharing info, not making any hypothesis let alone drawing any conclusion.
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