You need to go into the .ini files under your "my games" folder, which is default to my documents and then go to ureal tournament 3\UTGame\Config. In that folder there will be a file named UTEngine. Open it with notepad or some other type of editor and scroll down to [Engine.GameEngine] and change this command bSmoothFrameRate=TRUE to bSmoothFrameRate=FALSE
It should look like this:
[Engine.GameEngine]
bSmoothFrameRate=FALSE
MinSmoothedFrameRate=22.000000
MaxSmoothedFrameRate=62.000000
Etc...
I believe this is how you allow the frames to be uncapped. Even though this may not allow the game to run smoother the extra FPS will in a sense load itself to be ready to be sent to the server thus creating less lag. I didnt really phrase this correct, but less lag overall is the effect non the less.
This is how it is done for UT3. I do not have Gears, but I would assume it is done in a similar way. Hope this helps!
Best,
3Ball