I have 2 Seagate 80GB SATA in my system. I had them in a RAID 0 setup under Windows 2000 and performance wise it seemed just as responsive as my SCSI. However the drivers for the onboard SATA controller would clash with my USB devices and several of them wouldnt work.
In the end I gave up and moved the SATA over to Linux where I did some comaprisons after finetuning with hdparm. This tool reports the drives running in udma5 mode and shifting about 130MB in 3 seconds in a primary/secondary configuration. I ran the same test on a Segate 40GB ide drive and the results were lower.
Thats as far as I got with testing them out but under windows it was just too painful due to the USB issues. I logged a report about the conflicts at SIImage who make the onboard controller on the Asus A7N8X
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RoB