64-bit instruction set VS 32-bit physical address extensions

[i9i]

I plan to put PC-BSD on a Dell optiplex 745 with [per Dell's specs] a 2.8GHz Intel Pentium D Dual Core processor. I cannot find a processor with that name on Intel's ARK list, but I did find "Intel® Pentium® D Processor 820
(2M Cache, 2.80 GHz, 800 MHz FSB)." I ASSUME this is the same processor as is installed. The processor I found on the list is said to have a 64-bit instruction set; but 32-bit physical address extensions. Two questions: will the 64-bit version of PC-BSD run on this PC, and what's the difference between 64-bit instruction set and 32-bit physical address extensions? Part of the confusion is that Intel defines PAE as: Physical Address Extensions (PAE) is a feature that allows 32-bit processors to access a physical address space larger than 4 gigabytes. Thanks for your advice.

 

[Karsten75]

Yes, this is your processor: http://ark.intel.com/products/27512/Intel-Pentium-D-Processor-820-2M-Cache-2_80-GHz-800-MHz-FSB

The 32-bit physical address extension applies to running in 32-bit mode. Physical Address Extensions (PAE) is a feature that allows 32-bit processors to access a physical address space larger than 4 gigabytes, When running 64-bit OS, it is not relevant.