I have a custom built PC, its pretty outdated because it was built a while ago by my cousin, the graphics card it has now, which I can only tell my tilting my head under it and reading whats written is an ATI Radeon™ HD 5870 (something that does confuse me is that when I look up whats written on the graphics card the pictures that show up show one that looks pretty different then whats in my computer, but thats besides the point). Anyways a friend is getting a new card and was wondering if I wanted his, he has a sapphire Radeon hd 7770. I know little to nothing about these types of things and was wondering if anyone here can tell me if it would be worth it to take my friends card and completely deconstruct my current gaming setup to replace it, or if it is not. Thank you 
