Dell Optiplex SX280 upgrade



From what I could come up with these are the CPU's tha will work in your motherboard.

D7460 Prescott P4 530, 3.00GHz, 800FSB, 1M, Socket-T

D7462 Prescott P4 540, 3.20GHz, 800FSB, 1M, Socket-T

N8590 Prescott P4 540, 3.20GHz, 800FSB, 1MB, Socket-T

DD519 Prescott P4 64bit 541, 3.20GHz, 800FSB, 1MB, Socket-T

M8964 Prescott P4 550, 3.40GHz, 800FSB, 1MB, Socket-T
 
I can add and extend this list a bit, this is the list of Dell validated CPUs:

D7459 Prescott P4 Kit, 520, 2.8Ghz, 800FSB, 1MB
DD517 Prescott P4 64bit Kit, 521, 2.8Ghz, 800FSB, 1MB
D7460 Prescott P4 Kit, 530, 3.0Ghz, 800FSB, 1MB
DD519 Prescott P4 64bit Kit, 541, 3.2Ghz, 800FSB, 1MB
D7462 Prescott P4 Kit, 540, 3.2Ghz, 800FSB, 1MB
D7463 Prescott P4 Kit, 550, 3.4Ghz, 800FSB, 1MB
M8964 Prescott P4 Kit, 550, 3.4Ghz, 800FSB, 1MB
D7464 Prescott P4 Kit, 560, 3.6Ghz, 800FSB, 1MB
M8965 Prescott P4 Kit, 570, 3.8Ghz, 800FSB, 1MB

This is about it. Numbers on the left are Dell part numbers from some time ago.