Don't know if 4x2.5" SAS will fit as they are very thick to fit 2 in each cage.  I think the most will fit is 1 in each drive cage and 2 in 5.25" bay with adapter.
Hi,  Please I have a T7810 with 2x3.5 SATA drives. I want to upgrade to SAS drives, and I read in the tech sheet that it supports up to 4x2.5" drives. But it seems that I need a cage for that. Unfortunately, I searched for hours for the PN, but I didn't find (I find just the T7910 parts:  W80XH ). Can you help me with this PN? Thanks a lot.
Precision 7810 2.5 SAS drives cage - PN?