Short answer... It depends. There are several things to weigh before you throw out your old computer and buy a new one. You may only need to add memory and clean up your computer to get another couple years of productive use from your old system. Things to evaluate are your current processor speed, memory, hard drive capacity and health, age of the computer, software you use, and how you use your computer are all important questions in determining repairing or replacing the computer. If you are looking at new parts, or your computer is more than 4 or 5 years old, it is probably in your best interest to replace the computer.