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very slow hardware Raid 5

My setup is composed of a hardware raid 5 using 4 ide 200g drives connected with a highpoint RocketRaid 454.
I also have a 2 sata disk raid0 on the motherboard controller.

copying files to the raid 5 is dreadfully slow, around 0.8mb/sec.

at first i thought it may be the x64 drivers for windows xp pro x64, but i get the same speeds with 32-bit win xp.
the same thing happens when i create a hardware raid 0 and a software raid 0 with the drives on that card.

I get no errors, and i'm out of things to try/check before i RMA the card.
(the hard drives are fine if used independantly)

any ideas?
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tried that. one drive was slower than the rest, so i made a raid 0 out of just the 3 fast drives.
it's just as slow as when i was using all 4.

one interesting thing, is that it copies very fast for the first 20mb or so, then it slows down to a crawl...
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I did upgrade the firmware. I'm running an athlon64 3200 with 1 gig or ram, so that should be enough
i tried 2 promise controlleds together(both just 2 channel), and it worked a little faster, but not much.
then i tried the 2 onboard controllers and it was quite a bit faster, so now i'm running 2 raid 0's instead...
Thanx.