4x 16GB STT MasterDrive PX SSD @ ARC1231/ASR5805/HRR3520/ICH10R

[F.E.A.R.]

First, take 1000MB (Crystaldiskmark) - not 100MB, because your write-cache is greater.
IOmeter is a fine benchmark-tool. HDtune an HDtach are inexpressive benches (only seq. data-rate).

Try HDtune Pro (File Benchmark), h2benchw and FC-Test
I will see more random write benches.