The SR665 server has up to six 60 mm hot-swap fans. Five fans are needed when one processor is installed and six fans are required when two processors are installed. The server offers N+1 redundancy. The server also has one or two additional fans integrated in each of the two power supplies.

Depending on the configuration, the server will need either Standard fans (single-rotor 17K RPM) or Performance fans (dual-rotor 18K RPM).

Under the following conditions, Standard fans can be used:

No GPUs
No InfiniBand CX-6 adapters
No middle drive bays
No rear drive bays
Only the following front drive configurations:
8x 2.5-inch SAS/SATA
8x 2.5-inch AnyBay
16x 2.5-inch SAS/SATA
16x 2.5-inch AnyBay
8x 2.5-inch SAS/SATA + 8x 2.5-inch AnyBay
8x 3.5-inch SAS/SATA

If any conditions are not met, Performance fans are required.