Yes they are the same socket, both processors are 1366. My guess is probably for whatever reason thier proprietary motherboard doesn't support the upgrade. Usually OEM computers are very limited in what can be upgraded. If the motherboard doesn't support the 960 you would have to get a new motherboard which means new RAM and of course the processor. That right ther is half the computer that's why the tech said it would be easier to just get a new computer. Also have you gone onto Dells website and checked the CPU compatability list of your computer just to make sure what the tech said is right?