|Check with Dell support on this, they do not give much out as far as CPU support the way some others do. |
Even if it works, it is not worth it to spend very much on this upgrade just for maybe 12% increase in CPU speed. Your FSB, your RAM speed, your chipset, your graphics pipeline (AGP or whatever it is), and your IDE/hard drive pipe line, will still be running at the same speeds. You would gain almost as much overall improvement by wiping the hard drive and reinstalling Windows XP fresh on a clean drive. If you can get the CPU for between $10. and $20. and you still want to (assuming you can confirm support), then go for it. If it is much more than that, don't bother at all. You will never get it anywhere near the performance of a modern system, or even the performance you are expecting from the upgrade.
You have to be a little bit crazy to keep you from going insane.