I propose a change to the FAQ and closing policy:
I'd like to see all of the benchmarking questions closed with prejudice; I'm tired of seeing them. In my mind, the answer is almost always the same:
Put your scenario in place, add monitoring, add traffic, evaluate results. Modify based on results. Rinse. Repeat.
Add to the FAQ that questions ranging from the awful
to the specific
"I have a 42U rack with maxed-out HP Proliant DL360 G8's; how many concurrent users will that support running [app environment] on [platform]"
are going to be closed, because each application and environment is a unique and (more often ugly than beautiful) snowflake. You need to test your particular snow-flakey circumstances.
This is not to say that questions about poor performance shouldn't be allowed. "I'm running XYZ on ABC with CMYK and I'm RGB is slower than I'd expect. What should I check and what could I do to mitigate?" seems like a reasonable question to me...