From this link:http://support.intel.com/support/chi.../cs-009292.htm
Intel® Application Accelerator
ICH5 and the Intel® Application Accelerator
The Intel® Application Accelerator as well as the Intel Application Accelerator RAID Edition do not support the ICH5 I/O Controller Hub. The Intel Application Accelerator RAID Edition only supports the RAID controller in ICH5R and will not work with an ICH5 I/O Controller Hub.
If you have an ICH5 I/O Controller Hub, please use the Microsoft* native storage driver built into Windows*. The Microsoft native storage driver supports both Serial ATA and Parallel ATA hard drives.
It is important to know that there are two different ICH5 I/O Controller Hubs: ICH5R and ICH5. The letter 'R' in ICH5R identifies that the I/O Controller Hub has Intel® RAID Technology. ICH5 (without the letter 'R') identifies that the I/O Controller Hub does not have Intel RAID Technology. Intel® 865 and 875 chipset-based platforms may use the ICH5R or ICH5 I/O Controller Hub and which one you have is dependent upon your specific motherboard.
The 8890 has the ICH5 controller.