I have a problem with my 2 hdd's. I have 2 x seagate 1TB 7200.12 in raid 0 . My motherboard its an asus m3a78-t , 4 gb ddr2 800mhz geil ultra , amd 240@3860mhz , gtx9800 galaxy @ 800/1900/2600 (Core/shader/memory). My problem its caused by hdds in raid 0 the transfer goes down to 20M/s. I had raid 0 on an intel motherboard and ....110M/s constant copy transfer. The OS is win 7 64 bit. I am a bit lost with this motherboard.
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Sounds like one the hard drives has a problem. Run Seatools diagnostics and backup the array.