D875PBZ & RAID 0

I haven't quite seen this issue addressed in my Google search and hope
someone can give me some clues.

I've finally built my own computer around the Intel D875PBZ motherboard and
have two Western Digital Raptor SATA drives (36.7 GB each) in a RAID 0 (128
kB, striped) array plugged directly into the motherboard. Intel Application
Accelerator RAID edition v3.5. Intel BIOS P18.

Also have a 120 GB Maxtor DiamondMax Plus 9 for data storage running as
master on the primary IDE controller. It runs UDMA Mode 5.

Don't laugh, but about the only thing I have to test drive speed is EZ CD
Creator. EZCD has this System Test tool that says it tests the read speed of
system drives. It shows the following:

Maxtor - 54 MB/sec read rate.
Raptor - 48 MB/sec read rate.

I would have thought that the RAID'ed Raptors would come in significantly
higher than the Maxtor.

Am I expecting too much from the array? Is there a better performance test
tool I could use?

Thanks for any comments.

Lance
*****