Totally understandable. That's why I think we're all hopeful a stopgap solution will at least give you some playability. It's a little hard to predict exactly how much you'll gain in terms of performance. But what we can all say is there's no way having a dedicated graphics card could HURT you. So, even a $30-40 investment should give you a boost.
In other PC related news, I finally got a hold of one of the developers of the Euro Truck Simulator 2 multiplayer mod and he told me that they're releasing another build tomorrow which will allow for command line launch options. So, I should be able to use it with the Rift again. They've been pretty awesome with updates so far...I think that's like 3 in a 10 day span.
I also read people definitively saying that the mod does work best after you've bought your own truck. Not sure how I was able to get the jobs working last night without doing that...but it does seem to be very hit and miss. I also regret not buying all of the DLC paint jobs when they were on sale now...since we could choose one to be "CAG colors", haha (and for some reason, $2 is much less appealing than $1). Should be some great things in store for that mod though.