I have a older computer about a year and half or so. Here is a link to what it is: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01901210&lc=en&cc=us&dlc=en&product=4196147 What i'm wanting to do it upgrade my GPU and OC my CPU some. I was wondering what if any at all aftermarket heatsinks would fit the case and was wanting to get a 560 ti GPU. My 5770 now as it is hardly can play most of the newer games without overheating alittle and maxing out the load. I know I would have to get a better PSU too to run the new GPU and a OC. Just would be better, building a whole new comp with case and all or if the 560 and the heatsink would fit the case i have now. Not wanting to have parts just sitting around not being used is all. Thanks in advance for the help.