Yes it's under quick specs.
http://www8.hp.com/h20195/v2/GetDocument.aspx?docname=c04110916
Processors
Intel Core™ 2 Duo/Quad-Core Processor with Intel® 64 Architecture
Intel Core 2 Quad Q9650 Processor / 3.00 GHz, 12 MB L2
cache, 1333 MHz FSB
Y
N
Intel Core 2 Quad Q9550 Processor / 2.83 GHz, 12 MB L2
cache, 1333 MHz FSB
Y
N
Intel Core 2 Quad Q9505 Processor / 2.83 GHz, 6 MB L2
cache, 1333 MHz FSB
Y
Y
Intel Core 2 Quad Q9400 Processor / 2.66 GHz, 6 MB L2
cache, 1333 MHz FSB
Y
Y
Intel Core 2 Quad Q8400 Processor / 2.66 GHz, 4 MB L2
cache, 1333 MHz FSB
Y
Y
Intel Core 2 Duo E8600 Processor / 3.33 GHz, 6 MB L2
(shared), 1333 MHz FSB
Y
N
Intel Core 2 Duo E8500 Processor / 3.16 GHz, 6 MB L2
(shared), 1333 MHz FSB
Y
N
Intel Core 2 Duo E8400 Processor / 3.00 GHz, 6 MB L2
(shared), 1333 MHz FSB
Y
N
Intel Core 2 Duo E7600 Processor / 3.06 GHz, 3 MB L2
cache,1066 MHz FSB
Y
Y
Intel Core 2 Duo E7500 Processor / 2.93 GHz, 3 MB L2
cache,1066 MHz FSB