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3-Way SLI + PhysX GPU worth it? - Page 2

post #11 of 16
A physx card is NOT worth it. Especially not with tri-SLI.
post #12 of 16
Quote:
Originally Posted by nleksan View Post

The 650Ti is ideal for PhysX, even when running 3x GTX680 Classified 4GB cards. The new Boost version shouldbe even bbetter.

The thing to look for is having around 1/3rd the CUDA cores of your primary GPU.
Next is the clock speed, which is because the shader speed is tied to it. Overclocking the core will yield better performance.

What does not matter is the amount of VRAM or the speed, so don't bother with the 2GB cards or overclocking the memory.

The benefit is that in games with PhysX, you will see much more consistent framerates. I am upgrading to tri-670FTW in SLI and as I still have an extra x8 line's worth of bandwidth, and no room for hard drives beyond the 5 I already have (was going to get an LSI PCI-E3.0 Hardware RAID card but will wait until I move to a CaseLabs TH10 with all the goodies including the XL Pedestal), I figure $90 for the 650Ti on sale is worth it as I'll just use it for F@H whenever it's not actively involved in PhysX games.

would you please post your finding here when/if you upgrade?
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loon 3.2
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post #13 of 16
I don't think it's worth it, 3 cards should have enough power to run 3 monitors with PhysX. Just make sure you use 4GB cards tho, not 2GB.
Not bad
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Not bad
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post #14 of 16
I will certainly post my findings, I love experimenting (I am a Biochemical Engineer after all wink.gif ) and my most recent has been "The Relationship Between Memory Speed and Game Frame Rate", finding that contrary to what is currently held to be "true", increased memory speeds, specifically 2133 9-11-10-27, result in a minimum FPS that is between 6 and 17 FPS higher than slower memory speeds, specifically 1600 7-8-7-21 (I went with tight timings to make it a more "fair match", reducing variations in actual latency; the difference between the aforementioned 2133 and 1600 9-9-9-24, arguably the most popular/common speed used, was more along the lines of between 9 and 24 FPS!!!). Also, using Frame Time Analysis, the higher speed memory resulted in between 1/4 to 1/18th fewer "dips and spikes", and in every instance the dips were at least 33% smaller (i.e. only dipping 6fps instead of 9fps below average) but the vast majority were at least 50% smaller.
The result is GREATLY increased fluidity in games, with no perceptible stuttering, slow-downs, lagging, or anything like that. Testing with V-Sync, at 60hz, the 2133 memory resulted in completely constant framerates, while the 1600 memory had frequent but sporadic dips, a fair amount of which were quite noticeable; they occur most commonly when quickly swiping the mouse to look at a new area or when there is a sudden burst of action on screen.


I should be running all 3 cards within a month or two, and while I actually finally decided to go tri-SLI in order to get better experimental results of memory speed vs FPS in multi-GPU environments, I will certainly be willing to do some extensive tests with PhysX!
   
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post #15 of 16
When u have 3 cards, is the power conception is the same when you assign one gpu for physics
In my case I have 3 580s and if I assign one of my card for physic, so the one which is for physic take less power?
Is that true or is it the same power conception when Im enableing the all thee cards?
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post #16 of 16
Your 3rd card will require less load as I doubt it would max out your 580 with just physx rendering, by extension using less power
    
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