For X86 @ 1.3GHz comparisons refer to
http://www.cpuid.com/PentiumM/index.php
Interesting, The Pentium-M turns out well as expected but I know the C3 sucked but it sucks really badly in some of those tests.
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The
modern G4s (7447, 7457) should come in similar to the 1.3GHz Pentium-M but with 1/3 the power consumption. The top x86s will be around 2X faster but up to 10X the power consumption.
Don't go by power consumption figures for Mac G4s because they are not the same CPUs. They only used the top binned chips which can clock faster and use considerbly more power.
Now find someone who in general usage (i.e. not Photoshop) who actually notices the difference between 1GHz and 2GHz.
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As for benchmarks, look at what they are comparing, many CPU benchmarks which are comparing using different programs are not just comparing CPUs.
If you want to measure the CPU performance only you have to use the same OS, same application and same compiler. Very few if any CPU comparisions do this.
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Note: I don't generally give advice to people selling competitors products but this is about CPUs...
