This question already has an answer here:
I don't quite understand what was the point of closing http://stackoverflow.com/questions/7516987/computer-specs-for-r
The question was able to get an answer with 4 up-votes! It was favorited and up-voted. It could bring profit to the community. So I don't see why other people intrusively jump in and say "this is off topic." Who should define what is off topic? I think the people interested in that particular question and answer should!
EDIT: The question is about HW, but that's closely related to SW. The reply clearly shows it's not offtopic as it speaks a lot about software and packages - and that's already a good fit for Stack Overflow!
EDIT: The answer there has been particularly useful. Don't tell me that this doesn't belong to SO, when SO is site for programmers!
"... R appears to be able to use the GPU, see the gputools package and this link for an introduction. You would probably need to make sure that this works on whatever system you plan to install R on (which needs special attention if you are running on Linux). NVidia tend to be the best choice, as they are supported with Linux drivers (although they tend to propietary)...."