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SAS Expander Comparison Chart

 

SAS Expander Card Listing

 

 

Below is a listing of popular SAS expanders which are used to expand the storage capability of your controller card in a couple of different scenarios.

  1. One scenario would be a PCIe card interface which would go alongside your controller card to allow you to connect up to 20 or 24 drives internally. These are used in 2U/3U/4U storage rackmount servers which typically have 12 to 24 hard drive bays. In all cases, the PCIe cards can get their power from the PCIe slot, but in case you don't have any free slots you can power the expander cards with the provided 4 pin molex connector on the card.
  2. Another scenario would be to buy an expander in a 5.25" housing which you would then install in an external enclosure. Then you'd connect this expander enclosure you just made to your controller card via an external cable.

Deciding on which expander to get is pretty straightforward. Here are questions you need to consider:

  1. Q: Is my SAS controller 12G or 6G? A: Get a 12G expander if your controller is 12G. Get a 6G expander otherwise.
  2. Q: Are my hard drive bays internal with the controller card? A: Get a PCIe card to go alongside the controller.
  3. Q: Do I need to add an external chassis to expand storage? A: Get a 5.25" housed expander to mount nicely in the external chassis.
  4. Q: How many drives am I expanding to? A: Pick the appropriate expander which supports what you're doing. If a 24 bay chassis you should go with an Areca or Astek expander since the Intel and Adaptec models below support only 20 drives.

 


Model SAS Spec Form Factor Port Count Connectors

Adaptec 8588T

12Gb/s

PCIe card

36

2 x SFF-8644, 7 x SFF-8643

Intel RES3FV288

12Gb/s

PCIe card

36

2 x SFF-8644, 7 x SFF-8643

Areca ARC-8028-24

12Gb/s

5.25" housing

36

3 x SFF-8644, 6 x SFF-8643

Areca ARC-8028-32

12Gb/s

5.25" housing

44

3 x SFF-8644, 8 x SFF-8643

Areca ARC-8026-16

6Gb/s

5.25" housing

28

3 x SFF-8088, 4 x SFF-8087

Areca ARC-8026-24

6Gb/s

5.25" housing

32

3 x SFF-8088, 6 x SFF-8087

Astek A33606-PCI

6Gb/s

PCIe card

36

2 x SFF-8088, 7 x SFF-8087

Intel RES2SV240NC

6Gb/s

PCIe card

24

6 x SFF-8087



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