ATI Crossfire XTension: force AFR, scissor, supertiling modes

[thilanliyan]

http://www.gamethreat.net/forums/do...sion-v1-4-way-force-crossfire-w-profiles.html
http://www.gamethreat.net/forums/downloads.php?do=file&id=32

Thanks to evolucion8 for pointing it out.

That's pretty good that you can force those different modes. Now those of you with XFire comps, can you test it and report what you found (ie. how is the scaling with different modes, any glitches, etc.)?

 

[Sylvanas]

Bump.

Hugely interesting tool, as I said in the other thread if a reviewer could latch onto this and do up an article it would be greatly appreciated- I haven't seen any tests on the net between different modes, scaling and how microstutter is affected by different rendering modes (should be lessened or not existent on scissor and super tiling).

 

[evolucion8]

This is my story using Crossfire Xtension for Assassin Creed 2, the game by default doesn't support Crossfire. But at least it can be forced with Crossfire using the ATi CF Xtension, it allowed me to force Crossfire support with Assassin Creed 2 which doesn't have good Crossfire scaling. The AFR Method didn't work reliabily, The Scissor Mode showed much better results with great minimum frame rate, but never exceeded the 60% GPU usage in each individual GPU even with 24x Edge Detect Anti Aliasing, and Supertiling maxed my GPU usage showing more consistent frame rate than Scissor Mode aka Split Frame Rendering, specially in minimum frame rate. Assassin Creed 2 is a severely CPU bound game with a sickening Frame Rate cap of 62fps, awful with a 75Hz refresh rate.


Assassin Creed 2 was so CPU bound that I couldn't find a huge improvement in frame rate. Using 24x Edge Detect Anti Aliasing and using Adaptive Super Sampling at 1280x1024, the game felt choppy with slowdowns dipping in mid 20's at the minimum frame rate with an average of 33fps, going to Crossfire, allowed me to have a minimum frame rate of 33fps, average of 54fps and a maximum of 62fps which is the limit of the frame rate cap of the game. The performance difference between Super Tiling and Scissor Mode was very hard to notice, Super Tiling offers you slighly higher minimum frame rate at the expense of huge GPU usage, near 99% on each GPU, compared to the 60% average using Scissor Mode. So Super Tiling is less efficient in terms of power/performance ratio.

 

[thilanliyan]

Thanks for your results evolucion8.

 

[evolucion8]

With latest Cats 10.4, Crossfire Xtension won't work. I tried with Assassin Creed 2 and the ATi's Screen Space demo and the performance didn't improve. I forced ATi's Screen Space demo renaming the executable to AFR-FriendlyD3D.exe and worked like a champ, but it didn't work with Assassin Creed 2. Gotta love Multi GPU setups and hassles...

 

[mhouck]

I tried the program a couple weeks back and wasn't too impressed w/ it. I think it's going to be more valuable to people running at 2560 w/ AA enabled in games to use the sfr modes so the vram limitations are lessened. In my single 1920X1200 display I didn't notice any gains from the program at all.

 

[evolucion8]

The only way it seems to be working is when you select Force Crossfire, and it will simply rename the game executable, something that even my grandmother can do it. Pityfull.... at least AFR-FriendlyD3D.exe works.

 

[AndroidVageta]

Just tried this on Oblivion...which was seeing horrid frame rate drops and always seemed to be around 30fps...using XTension Im now getting 60fps (+-) and the game is SILKY smooth. Thanks for pointing this out OP!

 

[Alpha-Smit]

Just tried this on Oblivion...which was seeing horrid frame rate drops and always seemed to be around 30fps...using XTension Im now getting 60fps (+-) and the game is SILKY smooth. Thanks for pointing this out OP!

Hi, Where did you get the program? All download links that I have found are down... (I need a more recent version than 1.0)