They do JBOD, 0, 1 and 0+1 from memory. May also do RAID10. As you stated they can do RAID5 with the module. The modules are expensive and the XOR calculation speed on this chipset is woeful. The M5015 card has a much improved XOR performance and runs rings around the M1015. The beauty of the M1015 is that you can cross flash them to IT mode and use them as an 8-port HBA. They are cheap and plentiful, low profile, run cool. Basically - lots to like if you want to run ZFS. Absolutely. But sometimes a bit more info on the exact usage scenario can make things much easier and we can give much better info. It's also important to know what OS he will be using. If he wants FreeNAS with ZFS booting from USB and running say 4x 3.5" drives in the cage (maybe an extra 3.5" crammed in somewhere off the ODD SATA port) plus adding another 4x 1TB 2.5" drives in a 5.25" cage, the M1015 is best. Might also need an Intel PRO NIC in there, FreeNAS 8 has history of not liking the built-in Broadcom port. If he wants Windows-based (Or ESXi) with Hardware RAID5, he will need a P410 or similar. There's some cheap Adaptec cards out there for about $130 on eBay with a single SFF-8087, does RAID5 but the XOR is slow and the card is a slug. They will work but wouldn't be great.