If you were using a 9600GT then using anything better would be most likely bottlenecked by inferior CPU/RAM.
Unless he already made a significant upgrade to only his graphics crd theres a low possibility of this happening. people always have too much RAM (I have 8gb, about 4 too many), and cpus and gpus are usually indipendant in terms of being unbalanced in a system (I think that made sense) as they deal with different things (Logic vs display) so unless hes running a 2gb 1 core system he should be fine :)
besides what I pointed out about RAM tends to be the same with CPUs, as if you have anything over 2 cores, most programs aren't made to interact with the number of cores (Heck DF still runs on 1 core, and its a cycle hog)
basically he should be fine, unless hes running a dinosaur, in which case he'll run into power issues (But if he was running a 9600 he should be fine)
tl;dr: A ball dropped and a bullet shot level to the group at the same time will hit the ground at the same time.
