Depends on your goal, what are you trying to do that you need the performance increase? Do you have the money to get the 5000 now? What motherboard do you have?
If you have a decent motherboard and RAM and if you have the money to get the 5000, it may be worth trying to overclock it to get the performance of the 5000. Then if you are unhappy with it or are unable to get to where you want, just buy the 5000.