Double-check the wattage of your current and potential processors. My Windsor chart shows the following flavors:
AMD X2 5000: 65W or 89W
AMD X2 6000: 89W or 125W
AMD X2 6400: 125W
The specs Dell published on your desktop do not go into that kind of detail, but it doesn't look like the wattages are conducive to the upgrade.
I'm looking to upgrade the processor in my Dell desktop (531). I currently have an AMD 5000. I know that an AMD 6000 will work in this system. My question is, will an AMD 6400 work? I havn't seen a confirmed report of this working or not. Both the 6000 and 6400 operate on the same voltage and require the same amount of power (125w). They are also both windsor processors I believe. Basically the only difference I can find is the .2 ghz speed. Thank you for any thoughts.