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boards doing sata raid-5??

No it's correct, some of the Silicon Image SATA Raid chips support RAID 5. The one on the Asus A8N-SLI Deluxe / Premium also supports RAID 5. I'd guess it's the same chip.
However, the main processor will do the XORing to generate the parity stripe and you can't boot from the RAID 5 array. Hence it's not that useful.

To use RAID 5 realistically you need a RAID card with an onboard processor and cache and preferably, PCI-X or PCI-Express.
 
Not that useful? I was planning to replace my crappy old RAID server at home and this would definitely be nice. Just get a cheap 7200RPM drive as the startup drive, then make a RAID 5 array without having to buy a RAID card. It doesn't have to be super fast since it's a home file server. It just has to allow me to remotely log into it when I'm away from home and to allow me to access the files when I'm at home and on my network.

The appeal is in the low cost of setting up the RAID 5 config. You wouldn't need any add on cards. The only other thing that would totally own would be onboard video and you have a stand alone RAID 5 board. Just buy the mobo and some HD's.
 
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