>>>>>No. If anything you should see a small increase in speed because the OS will be using both cores.
>>>>>
>>>>>>Using VFP, if I upgrade to a dual core system, will the execution speed of my VFP apps slow down because VFP only uses one side of the dual core system?
>>>>
>>>>Thank you , young fellow.
>>>
>>>I suppose the next question to ask is: Does SQL Server take advange of 64 bit dual core processors?
>>
>>It appears to. We are using SQL 2005 64Bit Standard and Enterprise editions on a number of multiple XEON dual-core processor servers, and it really flies!
>
>Hot dang - Then I'll upgrade soon.

Well you better upgrade the OS to 64-bit too.
My dual core AMD 64 runs Windows XP and VFP and everything else just fine.
But none of it is 64 bit, and I don't think it would run 64-bit stuff unless it was supported by the OS.