The SR530 server supports up to six non-hot-swap system fans that provide N+1 cooling redundancy. SR530 server models with one processor include four system fans, and server models with two processors include six system fans.
Configuration note: The SR530 FAN Option Kit (4F17A12354) includes two system fans that are required for field upgrades that add a second processor to the server. If two processors are selected in the initial server configurations, two fans for the second processor are derived by the configurator.


https://lenovopress.com/lp1045-thinksystem-sr530-server-xeon-sp-gen2#cooling