Well a quick search seems to reveal that with decent SATA 2 drives expect about 250MB/sec performance and double that for SATA 3 drives.
My main HD - an old 1 TB drive transfers data routinely between 90 - 100 MB/sec - so at best I'd see a 150% improvement - not something to sneeze about.
I'd guess my rig is mainly CPU bound - quad core Conroe2 CPU mostly flogged when doing astro image processing.
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