I have used SATA RAID
PCI 2.2 Cards (64 Bit) in a board that had only 32bit slots before.. If you
call the manufacturer you may discover a lot of these cards will work in older boards. Although the motherboard you have chosen is rather small, and it looks like the electrolytic caps at the end of the PCI slot would be in the way for this type of solution.
both LSI and 3ware are well supported in Linux but neither has a 32bit card.
This is from one of the LSI SATA RAID Controller manuals.
Code:
* Complies with PCI 2.2 Specifcation
* Supports up to a 64 bit/66 Mhz PCI Interface
- Functions in a 64 bit PCI slot
- Functions at 66Mhz or 33Mhz
- Supports 3.3v and 5v PCI Signaling
- Is backwards compatible with previous versions of the PCI specification.
This is the only way I have found to use most hardware based RAID controllers in systems that only have a old style 33Mhz PCI slot.
Best of luck in your search.