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GTX590 + GTS250 physX would it be worth it on a EVGA SLI LE - Page 2

post #11 of 12
you wont really see an fps increase in some cases it can actually give u an fps drop just stick with the 590 its more then enough to do physx without a problem

yay this is my 500th post biggrin.gif
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post #12 of 12
Quote:
Originally Posted by windfire View Post
When 2 GPUs are in SLI, the workload is spilt up between them equally. (More accurately put, it is 'almost equally' because one GPU acts as the main one while the other GPU acts as a 'slave'. The main GPU has a slightly larger workload as it is responsible to coordinate its own work done with the work done by the 'slave' GPU just prior to sending to the monitor for display.) So, you would not see one GPU working at 90% while the other works at 70%. Both work at the same load of rendering.

Now, when Physx calculation is added, this workload cannot be spilt between them. Physx effect has to be done by one single GPU. So, when one of the 2 GPUs has an additional workload, part of its resources has to be allocated to this task. This would be a small part, relatively speaking, while the remaining majority of its resources is allocated to do rendering. As the two GPUs must work in sync, the other GPU (with its full resources to do rendering) has to 'slow down' a little bit to match the 1st GPU. This is where the non-optimum happens.

I learned this theory from Moderator brettjv. He did some Physx and SLI studies a while ago. I will post the link (which has numbers to backup the idea) when I find it.

BTW, 8600GTS in the video has only the bare minimum number of shaders (ie 32). It is just plain obvious too slow. The general agreement is that a minimum of 96-128 shaders is needed.



x8 speed will not hinder Physx performance.
For a card doing rendering, it might have a 1-2% negative impact.
For calculating Physx effects, the bandwidth requirement is much less. See the chart below. A GTS250 is between the GTX285 and GT240 and you can see the x8 speed has negligible effect.
Thanks for the clarification! didn't know this
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