Classic on a ramdisk absolutely flies - I tried it out about a year and a half ago. Unfortunately, it's not exactly a practical solution for most people. <img src="https://www.ubbcentral.com/boards/images/graemlins/wink.gif" alt="" />
All the tools we have for testing in-house are more targeted at stressing the server than actually determining application performance for UBB.classic or UBB.threads. (There is internal performance testing for UBB.x/eve.) Our general advice and guidelines for performance come from the past three years on the 6-series architecture and real world performance rather than artificial benchmarks.