In 2008 I built my own desktop. Four years later, the only thing I have upgraded is the video card, and the system is really starting to show its age. When I have a few programs running (generally chrome with a bunch of tabs, word, PP, matlab, etc) everything really slows down.
At first I figured I could replace the mobo and add 16gb of ddr3 ram, but then I realized my old cpu wouldnt fit in the new socket. Is there any way I could get more speed out of it, or is it time for a new one?
Really the only thing worth upgrading now is the CPU. Upgrading anything else will just result in a completely new build. You can buy a decent Motherboard/CPU/RAM bundle for around $250, and still use the rest of your parts. An SSD might be a good idea too, because HDD's begin failing after about five years.