Wow, these sounds like a good way to even power a system on the cheap. Enterprise class power for $14--yes please. 
From what I've read about these, they would be just sata since the drives being installed in them are mostly consumer sata drives.so are the hard drive backplanes have the expander chips on them and if so , do they support SAS 6Gb or SAS 12Gb or they just SATA compatible?
It is not clear which backplanes you are asking about. The thread was about Backblaze pods originally and then @kapone hijacked it to talk about his project. But in either case you will find the answers on the 1st page of the thread -so are the hard drive backplanes have the expander chips on them and if so , do they support SAS 6Gb or SAS 12Gb or they just SATA compatible?
I appologize for not being more clear. was asking about the backblaze storage pod backplanes. i JUST found the manuals for the backplane but wasnt clear if the expander chips did SAS or just SATA.It is not clear which backplanes you are asking about. The thread was about Backblaze pods originally and then @kapone hijacked it to talk about his project. But in either case you will find the answers on the 1st page of the thread -
https://forums.servethehome.com/index.php?threads/free-backblaze-storage-pods.24770/#post-230049
https://forums.servethehome.com/index.php?threads/free-backblaze-storage-pods.24770/#post-232039
It's SATA port multiplier - it only does SATA. You can tell by 1-to-5 port ratio. SAS extenders are usually 1-to-multiples of 4.wasnt clear if the expander chips did SAS or just SATA
Thank you for the info. My FreeNAS server (Dell r510) has 12 SAS drives 3.5" and 2 x 1Tb 2.5" SSD's in it and was looking to move to something i can grow into as im MAXED out right now.It's SATA port multiplier - it only does SATA. You can tell by 1-to-5 port ratio. SAS extenders are usually 1-to-multiples of 4.