Well after my recent experience I would say it's worth it just for the fun of it. You don't necessarily have to spend an arm and a leg to put together a decent kit. Depending on how much more the chip is willing to give, and what temperatures he is willing to keep, he should see a noticeable improvement. I haven't done much significant benchmarking since I put my cpu under water, but I was able to make pretty large voltage increases with still reasonable temps. I saw more of an improvement with my gpu than my cpu though.