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The Intel(R) Core(tm) i7 Extreme Edition processor i7-975 is a desktop processor while Intel(R) Xeon processors are addressed for server systems; due to this, the comparison result between both processor families is that they are completely different.
However, you can find the different Intel(R) Xeon processor specifications in order to determine which would be the one better meeting up your needs, at the following web site: http://ark.intel.com/
You might want to start looking from the Intel® Xeon® Processor 3000 Sequence and above.
For performance information, feel free referring to: http://www.intel.com/performance/
In case any further assistance is needed, or more specific information/details, feel free contacting customer support for assistance: http://www.intel.com/p/en_US/support/contactsupport