GL_EXT_reme
Humus' GL_EXT_reme test is another that functions well in SFR and fullscreen AFR modes.
SFR is the preferred mode for the render setup presented by GL_EXT_reme, with the test using Doom3's fullscreen AFR performance mode in the driver (which may or may not be suboptimal). Regardless, SLI accelerates rendering by up to 99% over and above the original score in single-GPU mode. Average increase is 65% in AFR mode, 70% in SFR load-balanced mode. The multi-texture fillrate test is accelerated well and the overdraw test affecting geometry is accelerated in both modes.
Theoretical performance summary
It's clear that measuring theoretical increases for SLI is somewhat of a challenge. Rightmark for example, a great test in single-GPU mode, has performance culled using SLI due to driver inoptimisation. And that highlights one of SLI's flaws. It's not a global performance increase, especially if the driver knows nothing about your application.Theoretical performance was able to be measured however, using tools such as 3DMark and GL_EXT_reme, showing that SLI is capable of large performance increases.
