Oracle Performance on Sun X-series vs. M-series

Has anyone tried migrating from a V440 or similar to the Sun X-series machines, 
or benchmarked performance of Oracle on an X-series compared to an M-series?  
We're considering trading in the T2000s for either M4000s or X4250s.  The 
M4000s are midrange servers running quad-core 2.4GHz SPARC64 VII processors for 
about $50k and the X4250s are quad-core 3GHz Intel Xeons for about $5k.  I know 
the SPARC is RISC and the Xeon is CISC and I'm not sure about all the other 
technical differences such as cache, bus speed, etc., but looking only at $/GHz 
(dollars per GHz) the X-series blows the M-series away.  I'm not a hardware 
expert, but I'm guessing that's not exactly a valid comparison given the 
different architectures.  I'm just curious what real life testing with an ERP 
application running on an Oracle database would have to say about it.  I 
googled for such a benchmark and couldn't find anything along these lines.

Thanks,
Brandon

Reference:
http://www.sun.com/servers/x64/x4250/index.xml
http://www.sun.com/servers/midrange/m4000/index.xml


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