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Some tests with a new GTX680 SLI subsystem reveals that a 2 GB frame buffer is not enough for 32x CSSA combined with 8x SS Transparency Supersampling in rF2. At Spa with 25 AI, the average frame buffer use is 2.4 GB (as tested with a 3GB GTX580 SLI subsystem), multiview on, no HDR, shadows at medium. Even at these settings, aliasing artifacts are clearly visible at 6004X1200.
Because of the constant swapping out of textures from main to graphics memory stuttering is very pronounced whenever there are large texture changes in scenery or AI cars pass.
The GTX680 does much better in rf1 where AA can be increased to 32x S (2x2 SS + 8x MS) with transparency Supersampling at 2x SGSSAA. There are no aliasing artifacts at this level. The maximum memory used was just under 2 GB at Targa Florio with 15 AI and all settings at max including shadows. Frame rates were steady at 60 throughout most of the course, occasionally dipping to 52.
It seems likely that rF2 will require an SLI subsystem with at least 4 GB of frame buffer per GPU to accommodate a resolution of 5760x1200 with multiview, HDR and all in game settings at maximum on longer courses.
The attached image shows the GTX680 SLI subsystem performance at Targa Florio. Note the high GPU clocks. rF1 seems capable of using all available GPU power but it finally allows 60 fps game play with all graphics options on at supersampling AA levels. In fact it is so good, I have started playing rF1 in preference to rF2 again.
View attachment 2794
Nvidia systems used for this test were:
MSI Lightning Xtreme GTX580 3GB SLI (834 MHz core)
Galaxy GTX680 SOC 2GB SLI (1202 MHz core)
Because of the constant swapping out of textures from main to graphics memory stuttering is very pronounced whenever there are large texture changes in scenery or AI cars pass.
The GTX680 does much better in rf1 where AA can be increased to 32x S (2x2 SS + 8x MS) with transparency Supersampling at 2x SGSSAA. There are no aliasing artifacts at this level. The maximum memory used was just under 2 GB at Targa Florio with 15 AI and all settings at max including shadows. Frame rates were steady at 60 throughout most of the course, occasionally dipping to 52.
It seems likely that rF2 will require an SLI subsystem with at least 4 GB of frame buffer per GPU to accommodate a resolution of 5760x1200 with multiview, HDR and all in game settings at maximum on longer courses.
The attached image shows the GTX680 SLI subsystem performance at Targa Florio. Note the high GPU clocks. rF1 seems capable of using all available GPU power but it finally allows 60 fps game play with all graphics options on at supersampling AA levels. In fact it is so good, I have started playing rF1 in preference to rF2 again.
View attachment 2794
Nvidia systems used for this test were:
MSI Lightning Xtreme GTX580 3GB SLI (834 MHz core)
Galaxy GTX680 SOC 2GB SLI (1202 MHz core)
