Dude, I feel your pain. I have exactly the same problem on XP Pro as you and it did it's best to waste half my day yesterday. I was getting blue screen reboots, pauses occasionally too of up to 40 seconds where nothing would respond on the machine, iastor errors in the system event log, no fun at all. I had the 4 drives running in slots 1,2,3,4 and a dvd drive in 5. I changed all 4 drive cables and swapped them to slots 1,2,5,6 and had the dvd in 4. Booted back up as expected, made zero difference to the stability. I ran hdtune etc to try and stress the array and it would last less than 30 seconds before pausing but would then unpause and continue to run briefly again. I eventually got a read error on one of the runs, the intel raid manager flagged up an error on one of the drives and I rebooted.
Drive now flagged as having a problem. I reinstalled with just a 3 drive stripe, leaving the apparantly 'problem' drive as a single drive so that I could run tests on it. The WD diagnostics ran the full suite and it passed everything without error. I have used both the 0304 bios and the 0311 bios, stock clocks and a mild 3Ghz oc on a Q6600. No dice. These same 4 drives ran as a quad stripe flawlessly in both a P5WDH and a P5W64.
Don't take this the wrong way but I am glad that someone else seems to have the same issue that I have.
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