iMac Intel 27" EMC 2309 and 2374 Teardown
Quote from CrimsonS:
You say that there isn't room for another drive; does that also go for 2.5" SSDs? Are there extra SATA ports on the logic board for more than the single drive anyway?
You can maybe use SATA port multiplier and, from photos, I would say that there is enough space for 2,5" SSD behind GPU heat-pipes ? right ? (although maybe it is not best idea to put SSD close to heatpipes :D)