thinksystem sr650 v2 standard fan option kit 4f17a14497caratteristichedescrizionethinksystem v3 2u standard fan option kit (contains 1 fan) standard fans (single-rotor, 17k rpm, 60x38 mm) configurations rules: with 2 cpus installed, 6 fans are required with 1 cpu installed: - configurations without mid-chassis drives, rear drives, and riser 3 only require 5 fans - all other configurations require 6 fans