I have the same rev and boxes(I wouldnt get to hung up on this by the way!) I am running 2 xT7K500 on the ICHR controller with matrixs RAID 0/1 on both disks and have no problems at all. I was running them as single drives no problem before. Latest BIOS 0402 fixes most sata releated issues except for samsung.
What the rest of your setup and what do you mean by several errors? Have you run a diskscan for errors? Check drives with HD tune and HD TAch and see what performance you get.
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