AMMP sp4 summary (format of table 5 in the above reference).

Average RMS on geometry 0.55 Å
Number with RMS > 0.64
Energy RMS1.58275 kcal/mol
Number of Pairwise errors > 38
Maximum Pairwise error4.62 kcal/mol

Beachy et. al., generated a test suite of 10 conformations of the tetrapeptide n-acetyl-ala-ala-ala-n-methyl amide. The benchmarks were retrieved from the site and run on a pentium II under windows NT 4.0 using the current version (1.2) of AMMP. These results put AMMP with the SP4 potential near the top of the list.