UPDATE:
Basically, Rage in it's current state has issues. So here's what I've come across for fixing it as much as possible, until we get better drivers and probably a patch or two from id.
Firstly, using the "Rage" driver from AMD does help performance, but it also won't allow crossfire to work. Still, my single 5850 with all the following tweaks runs a steady 60fps and doesn't even top out it's usage (sometimes as low as 40%). If you're using AMD card(s) and the game crashes at startup, you need to disable Triple Buffering in your Gaming options of CCC.
Ok, so first off, Rage is supposed to have a folder created for it in your AppData folder. You need to make sure you have this folder created (manually):
users\username\appdata\local\id software\rage
Once you create that, as soon as you launch the game you can check it, and there will be a 1gb cache file in there. It helps with performance and texture popping.
Secondly, there's Bethesda's blog commenting on how to make the game load bigger texture files (8k) as well as how to force vsync:
http://forums.bethsoft.com/index.php?/topic/1236250-rage-support/page__p__18743528#entry18743528
This drastically helps by making the textures as crisp as possible (though not what I'd consider HD by any measure) as well as fixing screen tearing.
Secondly you have Geforce also offering some insight into tweaks, some are similar to what's already seen:
http://www.geforce.com/News/articles/how-to-unlock-rages-high-resolution-textures-with-a-few-simple-tweaks
Finally, probably the best fix is to create your custom config file which can include any of the above fixes (this one here has vsync and 8k textures). That is to say, the fixes say to add them to the launch options, but it's easier to just save them in a config file. You have to make the file yourself using notepad and save it as rageconfig.cfg inside the rage/base folder.
EDIT (Oct 8):
This is the best config file I've used yet, and it's easy to tweak. Just keep in mind you need to add the FOV, vsync, and skip intro variables to launch options as they don't get executed properly from the config.
Anyway, go here for the best config file yet:
http://donotargue.com/cfg-makers/rage/
Basically, Rage in it's current state has issues. So here's what I've come across for fixing it as much as possible, until we get better drivers and probably a patch or two from id.
Firstly, using the "Rage" driver from AMD does help performance, but it also won't allow crossfire to work. Still, my single 5850 with all the following tweaks runs a steady 60fps and doesn't even top out it's usage (sometimes as low as 40%). If you're using AMD card(s) and the game crashes at startup, you need to disable Triple Buffering in your Gaming options of CCC.
Ok, so first off, Rage is supposed to have a folder created for it in your AppData folder. You need to make sure you have this folder created (manually):
users\username\appdata\local\id software\rage
Once you create that, as soon as you launch the game you can check it, and there will be a 1gb cache file in there. It helps with performance and texture popping.
Secondly, there's Bethesda's blog commenting on how to make the game load bigger texture files (8k) as well as how to force vsync:
http://forums.bethsoft.com/index.php?/topic/1236250-rage-support/page__p__18743528#entry18743528
This drastically helps by making the textures as crisp as possible (though not what I'd consider HD by any measure) as well as fixing screen tearing.
Secondly you have Geforce also offering some insight into tweaks, some are similar to what's already seen:
http://www.geforce.com/News/articles/how-to-unlock-rages-high-resolution-textures-with-a-few-simple-tweaks
Finally, probably the best fix is to create your custom config file which can include any of the above fixes (this one here has vsync and 8k textures). That is to say, the fixes say to add them to the launch options, but it's easier to just save them in a config file. You have to make the file yourself using notepad and save it as rageconfig.cfg inside the rage/base folder.
EDIT (Oct 8):
This is the best config file I've used yet, and it's easy to tweak. Just keep in mind you need to add the FOV, vsync, and skip intro variables to launch options as they don't get executed properly from the config.
Anyway, go here for the best config file yet:
http://donotargue.com/cfg-makers/rage/