Only for the extra video card features(GPGPU capabilities in a lot of applications, video processing benefits). In my opinion(I'm saying this based on my pc-using experience), is good to have an capable co-processor to certain tasks, once you have a relatively powerful PC.
Anyway, you want to save money, is better to forget this. The HD 4600 will do a very good job here too.
HD4600 can accelerate more content than the 48xx card can anyway. If he's not gaming or DC projects, there's literally no reason to keep the card in there unless you want a hotter, louder more power hungry system for no reason. Actually you can even take of DC since most of them have stopped support for that card anyway.
What I'm getting at is, for the stuff the OP wants, not only will HD4600 do it, but it will actually do it better.