I've got two Seagate Barracuda 7200.9 8MB ST3200827AS, on an nVidia RAID 0 array and a 32K stripe. The motherboard is an Asus A8N32-SLI Deluxe.
Perhaps I'm just being a little unfair on the drives - I mean, they are wonderful drives - but have a look at this benchmark that I obtained from HD Tune...
Is it just me, or does this seem a little show? Are my drives underperforming?
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I think the problem could be your small stripe size. 64K is generally a good size.
I'm not sure what my stripe size is, but my RAID seems to "underperform" as well. I posted about this a while ago, and someone suggested that it was the NForce RAID controller not being up to the task.