Intel will be offering three variants of ICH9, instead of the two ICH variants in recent history. As in the past, there will be a standard ICH9 that leaves out RAID support—what Intel dubs Matrix Storage Technology. Above that is the ICH9R, which integrates RAID support.
ICH9 supports only 4 SATA ports, and doesn't implement Intel Matrix Storage. ICH9DH ("DH" for "Digital Home") adds two more SATA ports, plus Intel Matrix Storage technology (without RAID.) It also supports Intel's ViiV multimedia capability. Finally, ICH9R adds the above, plus RAID.
TheMajorMMX - Intel P200 MMX @ 225Mhz - V-Tech (PcPartner) Baby-AT mb w/ Intel Triton TX chipset - Nvidia Riva TNT2 M64 w/ 16MB - 256MB M-Tec SDRAM - Still running.....