I wonder if the community found tricks to achieve maximum performance when rendering to FBOs under a SLI configuration.
There is currently three SLI modes available on GeForce cards: SLI AA, split frame and AFR. Unfortunately, for latency reasons, Alternate Frame Rendering is not an option for me. Here is what happen under the hood...
SLI AA mode:
You loose the increased 2x MSAA samples. Ex.: Rendering in SLI AA 16x you only get 8x MSAA samples in your FBO.
SLI split mode:
No performance 2x gain over single card configuration. Each GPU renders the whole image into FBO.
FBOs are the only way to render to non displayable HDR formats and I can't beleive there is no way to make use of the extra card in SLI mode.
Note: I did my tests using two 8800 GTX.
Cub
There is currently three SLI modes available on GeForce cards: SLI AA, split frame and AFR. Unfortunately, for latency reasons, Alternate Frame Rendering is not an option for me. Here is what happen under the hood...
SLI AA mode:
You loose the increased 2x MSAA samples. Ex.: Rendering in SLI AA 16x you only get 8x MSAA samples in your FBO.
SLI split mode:
No performance 2x gain over single card configuration. Each GPU renders the whole image into FBO.
FBOs are the only way to render to non displayable HDR formats and I can't beleive there is no way to make use of the extra card in SLI mode.
Note: I did my tests using two 8800 GTX.
Cub