IBM x3690 X5 Service Manual page 301

Supported SAS/SATA drive backplane configurations:
The following are illustrations of the hot-swap drive backplanes that are supported
on the server.
4x2.5-inch drive backplane rear view:
Configuration
SAS signal
connector
connector
SAS power
connector
8x2.5-inch drive backplane rear view:
SAS signal
connector
Configuration
connector
8x1.8-inch drive backplane rear view:
SAS signal
connector
SAS power
connector
Chapter 5. Removing and replacing components
283