I've got a really old computer that a friend passed on to me assembled by a company called alienware and it contains a radeon x1600 graphics card thats been causing a lot of trouble lately by overheating (I've used gpu-z to monitor temps), I guess the fan is somewhat broken on the graphics card. So I was wondering if I could upgrade the radeon x1600 to a more advanced sapphire hd 6450 ? The motherboard in the computer is a intel d975xbx. Is this compatible with the aforementioned graphics card ? I'm only asking here because I know nothing about computers and I don't want to order a new graphics card and then in the end it won't work. I'm also open for any other suggestions in regards to graphics cards that will work well with my motherboard.
Many thanks to everyone responding in advance,