The Intel RES2SV240 24-port SAS2 Expander Card is based on the LSISAS2x24 expander chip. The LSI SAS2 expander chips are arguably the best SAS2 expander chips on the market. They're frequently OEM'd and found on RAID adapters like the Areca 1880i series, Areca expanders, Supermicro backplanes as well as LSI's own offerings.
Official Intel Product Page
- MOLEX connector for power, unlike the HP SAS Expander
- Negotiates SATA up to 6G, unlike the HP SAS Expander which maxes at 3G for SATA disks
- Comes with 6 miniSAS cables: 2 x 10" and 4 x 24"
- Can be combined with the Supermicro ATX power control board for an inexpensive JBOD expander chassis
- Can be dual-linked (link aggregated) with RAID/HBA's and additional expanders for increased throughput
- Ideal for a 20-bay chassis like the Norco RPC-4220
- 24 ports at around the same ~$250 pricepoint as the 36-port HP SAS Expander
- Not ideal for a fully populated 24-Bay server case since it only has 20 usable ports after an uplink to an RAID/HBA card
- No external SFF-8088 port, which would mean an SFF-8087 to SFF-8088 adapter bracket (~$35) would be required for building an JBOD expander chassis.
Bottom line: Due to its ability to negotiate a 6G link with SATA-III harddisks, the LSISAS2x36 (which the LSISAS2x24 is binned from) *is* the superior SAS2 expander chip compared to the slightly older PMC8005 found on the HP SAS Expander. Unfortunately the 36-port LSISAS2x36 hasn't yet shown up on a dedicated expander PCIe card, its currently only found integrated with other products as mentioned.