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Quick phys-x question - Page 2

post #11 of 16
Currently there is not a GeForce WHQL driver that supports both GTX570 and GTS450.

You can try:
1. 266.35 Beta (non WHQL) which supports both cards
2. installing 2 drivers, one for the GTX570s and another for the GTS450. One driver on top of another.
3. use a mod version of a Quadro driver (266.44?)

Nvidia should release a WHQL driver soon.
post #12 of 16
Quote:
Originally Posted by reflex99 View Post
This is false

4ish % is more than 0%
You're quick! you already quoted before I could edit my post
>.<

EDIT: well that was pointless

anyway, about that 4%...

let's say you get 150 fps on a game, and you lose 4% of that. What is that? Like 6 Fps?

Would even really notice a reduction of 6 FPS?
Edited by tryagainplss - 1/6/11 at 10:44pm
    
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post #13 of 16
Quote:
Originally Posted by tryagainplss View Post
You're quick! you already quoted before I could edit my post
>.<
like a ninja.

You really need a GTX 460 or higher for it to out perform a 570 in physx
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post #14 of 16
you would probably get more problems than you would get performance
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post #15 of 16
Quote:
Originally Posted by reflex99 View Post
like a ninja.

You really need a GTX 460 or higher for it to out perform a 570 in physx
I tend to disagree. With a single 570, you have 480 cores to do both rendering + physX. With a 570 + GTS450, you have 480 + 192 cores to do both rendering and physX.

Unless the scenario is that the physX is SO intense that it's gobbling up the power of like 250 cores, yet the actual scene is so simple that the 570 really only needs 230 to render it ... I have to think that the 570 + dedicated 450 setup is going to perform better. And I really doubt that'd be a likely scenario anyway.
Edited by brettjv - 1/6/11 at 10:54pm
    
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post #16 of 16
Further expanding on what brett said above, let me supply some numbers.
As GTX570/580 are fairly new, there is not much real world data out there and so let's settle for GTX470/480 for the moment.

Reference link:
for GTX480 SLI + 9800GT (Physx)
http://www.evga.com/forums/tm.aspx?m=328576&mpage=1

for GTX480 SLI + GTX285 (Physx)
http://www.evga.com/forums/tm.aspx?&m=330659&mpage=1

These links are indicative (especially the first one) to show that even a humble 9800GT can help out by being a Dedicated Physx when paired with GTX480 SLI (confirmed by 2 individucals- rhcliff12 and jdookie). The key is ''resolution and AA''. At lower resolution/AA (eg 1920x1200 + 4AA), a pair of GTX480s is obviously powerful enough to do both rendering and Physx. At higher resolution/AA, the benefit of a 9800GT Dedicated Physx card begins to show.

And, as for PCIe lane speed assignment goes, your EVGA X58 FTW3 will go from ''x16,x16'' to ''x16,x8,x8'' and I think this reduction in speed is negligible (ie worthy to exchange for the benefit of a Dedicated Physx card as GTS450) at around 2%.

Then, there is the heat issue. For OP, the upper GTX570 sits in PCIex16_1 and is unaffected. But the lower GTX570 (in PCIex16_2) will see a rise in temperature as its air intake will be disrupted to a certain degree by the addition of a Dedicated Physx card (at PCIe x16_3). But it should be manageable.
And power-wise, OP's 1200W has no problem at all.

So, all lights go green, IMHO.
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