Hi,

This are the validated processor types for the M17XR1:

Core 2 Duo

Intel® Core™ 2 Duo Processor P8600

Intel® Core™ 2 Duo Processor P8700

Intel® Core™ 2 Duo Processor T9600

Intel® Core™ 2 Duo Processor T9800

Core 2 Quad

Intel® Core™ 2 Quad Processor Q9000

Intel® Core™ 2 Quad Processor Q9100

Core 2 Extreme

Intel® Core™ 2 Extreme Processor QX9300

Thanks. for the information? Are you certain on the higher performing CPUs? I looked up the Intel® Core™ 2 Extreme Processor QX9300 and it appears to be compatible with the Socket P (478) not 479. Just want to confirm that this is a valid upgrade. Thanks in advance.