The PCMark 10 Storage tests do include some cache flushes in their traces. I haven't started extracting and graphing those stats, so I don't know if it's enough

The PCMark 10 Storage tests do include some cache flushes in their traces. I haven't started extracting and graphing those stats, so I don't know if it's enough to say anything meaningful about how a drive would perform on sync-heavy workloads like a database.