i have a pc having two hd 5970 and one nvidia 470 gtx , all watercooled ;'']
it seems impossible to have the nvidia gpu doing the transcoding without a patch like hybridphysx that makes the 2 batman or mafia 2 having the physx support and rendering .
here are some screens of my pc running gpu-z gpu-shark or batman2 and 3 tv screen ... may be soon Rage ;"]

edit i can not post link$....
it seems that selling id-software was the worst thing to do for the gaming community

thank you in advance in case of someone makes the patcher

I guess you need to somehow make sure the GeForce card is the primary rendering device.

Looking up hybridphysx I see the latest is http://www.ngohq.com/graphic-cards/17706-hybrid-physx-mod-v1-03-v1-05ff.html that should work with Nvidia 285.58 /295.62 drivers.
Even if hybridphysx doesn't work with the latest NVidia drivers why not just use the version that it does work with?
Heck I run older drivers all the time if they suite my purpose and work without problems.
The newest driver is not always the best especially if it doesn't work as you wish it to.

i prefer to have the 4 ati gpu doing the rendering and the geforce to do the transcUding . for id &nvidia question is : are the gpu useable like some co-processor or not ?
i think i was able to play like that when game was just released....

i already use the 1.05 , with batman it also needs a special physxdevice.dll .
it should be the same here , somewhere in the game code re-check the primary card and then select to do transcUding or not , that s the point the patch or update should remove
[sorry i had to remove your link because i am not authorized to "play with them" and re-post some , even in quote ........]

But Rage doesn't support SLi or Crossfire.

I will be experimenting with this and other things with Rage Monday. Thanks for posting, since I didn't know about it until now.
I finally picked me up a http://www.newegg.com/Product/Product.aspx?Item=N82E16814150477 for a fair price, should be here Monday, I guess $105 was a fair price?
I've only used Nvidia vcards to play Rage up until now.
Heck I haven't owned a ATI card since the 300 card days. lol
I only bought the 5850 to try it with Rage, well that and I have been wanting to try out a ATI/AMD card for quite some time
but I do a lot of Folding at Home and they just didn't fold well enough for me to buy one.
I'm not really a fan of either as far as for playing games only.

I have exactly that card, and the game works all fine with Cat 12.3.

Just remember that GPU Transcoding is only available on nVidia cards.

you seem right for sli : [ the game indicates nothing about sli or 3dvision or even physx or cuda at geforce page with list of games

with ati , the crossfire is working until 11/21/2011 Catalyst 11.11a Performance Driver :
·Rage
Delivers AMD CrossfireX performance scaling
Resolves a number of image / stability issues seen with the title:
Fix geometry corruption, sometimes seen in Bash TV entrance
Fix issues with Low-memory conditions on 32bit systems.
Fix issue with extreme corruption with missing textures on 32bit systems.
Fix memory leaks when deleting/reusing sync objects.
Fix hitching and pausing, especially noticeable on some Quad Core systems when doing races and Stanley Express runs.
Fix some missing shadows


drivers AMD Catalyst? 12.1a preview driver
Resolves some new texture corruption issues introduced by the latest version of the game
Improved performance ~5%
Smoother game play and reduces multicore sync points
Fixed mapbuffer failures when switching maps on 32-bit systems.
Fixed a game crash when switching maps back and forth on 32 and 64bit systems


AMD Catalyst? Software Suite Version 12.2
3/12/2012
Resolved Issues for the Windows 7 Operating System
Rage: System crash when playing with Crossfire enabled.


so it looks like nvidia is not the card to use with this game ;'] except for transcuding
game is very smooth with 4 gpu but of course when i turn back there is a little latency before the textures apply well .
if the gtx 570 would do the work then the game would be perfect .
my bench are giving 120 and some 460 are having 260 , so i should be above 300

Main reason I got the 5850 was to see what all the fuss was about on the other side of video cars with this game Rage.
I wanted to get something AMD way before now, just couldn't find anything in my price range I wanted to spend on.
I hope to see good results, I guess it all will come down to using the right driver as to how that will work out.
Any suggestions where I should start with drivers, I see you said 12.3 but is that where I should start?
OS will be W7 64bit with 2600K rig in my sig.