The only time that you want to use a GPU is when your code has a high proportion of numerical operations, and when your problem can be executed in parallel. (modeling, graphics) If this is not the case then using a GPU is not going to speed things up. Code where you are mostly just moving data around with sparse calculations (routers, databases, webservers, AV) is not a good problem for video cards.

You'd think that linux would have solved the "having to physically move the box" problem by now, sheesh