Hi Mike,
Basically i have just checked on the list of compatibility, and this board does not support any quad core cpus (775 socket). It supports only cpus LGA771 Socket.
Here are the list of compatible cpus:
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Website: http://support.intel.com/support/motherboards/server/sb/CS-022346.htm
Please note:
There are two types of this board:
(i) Non- Refresh Board (old)
(ii) Refresh Board (there is a letter 'R' at the end of the sku)
Apparently, your one seems to be a non-refresh board as there is no letter 'R' at the end of the sku code. If your board is non-refresh version, it is compatible with only 65nm cpus from the list not 45nm cpus. So please make sure you double check before getting a cpu.
How to check if your motherboard is compatible with the 45nm cpu?
If your board pba number is on the list, it will work with the 45nm cpu.
Website: http://support.intel.com/support/motherboards/server/sb/CS-028540.htm
Please note before changing your cpu, make sure to update the bios, bmc and sdr firmware as a precaution. As some cpus need a bios update in order to work with a certain board revision.
Here are the list of compatible and tested memory:
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Website: http://support.intel.com/support/motherboards/server/s5000pal/sb/CS-022919.htm
Hope this will help you to find a cpu and memory. If you need more help, reply with your board pba number.
Kind Regards,
Aryan