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SATA RAID throughput question

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A question to the SATA RAID Experts:

We measured the throughput for an INTEL SCRS28X SATA RAID controller with a few SATA II drives and determined, that we realize a data throughput (all cache modes disabled -> write through) from about 0.2 upt ro 0.8 MBit/s. The same drives connected to the onboad RAID controller results up to max 3 MB/s (also cache disabled). This happens also in modes without any RAID. Which cache mode enabled, the drives have a expected throughput from about 60 MBit/s on both controllers.

Does somebody have an explanation for me, why the throughput is such poor if caching is disabled?

We measured with benchmarking tools, but also if you just copy a file around, you "feel" the poor performance.
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