Dimesnion E520 CPU

list of compatible processors.....

Conroe, E6400, 2.13G
Conroe, E6700, 2.66G
Conroe, E6300, 1.86G
Conroe, E6600, 2.4G
Prescott P4, 541, 3.2G
Prescott P4, 524, 3.06G
Prescott Celeron, 351
Prescott Celeron, 346
Prescott Celeron, 336
Prescott P4, 531, 3.0G
Presler P4, 940, 3.2G
Presler P4, 945, 3.4G
Presler P4, 930, 3.0G
Presler P4, 925, 3.0G
Presler P4, 950, 3.4G
Cedar Mill, 661, 3.6G
Cedar Mill, 651, 3.4G
Cedar Mill, 641, 3.2G
Cedar Mill, 631, 3.0G

I'm typing this on a dimension E520 that's running a core2duo E4500... bios update 2.4.0... might need to update your list :)