ScienceMark
ScienceMark is optimized for SSE, SSE2, 3DNow! and is multithreaded, as well. In the interest of full disclosure, I should mention that Tim Wilkens, one of the originators of ScienceMark, now works at AMD. However, Tim has sought to keep ScienceMark independent by diversifying the development team and by publishing much of the source code for the benchmarks at the ScienceMark website. We are sufficiently satisfied with his efforts, and impressed with the enhancements to the 2.0 beta revision of the application, to continue using ScienceMark in our testing.

ScienceMark's problem-solving tests show us what we've come to expect by now—that performance difference between the 875P, 915G, and 925X are fairly minor, and that the 915G and 925X tend to trail the 875P slightly when chipsets do matter.

The Prescott Pentium 4s put on a show in DGEMM, displaying their improved SSE2 performance. Again, chipsets aren't much of a factor.