https://www.intel.com/content/www/us/en/content-details/811826/sr4850hw4-pcn-106253-00-product-material-class-2-change-to-rohs-power-supply-and-rohs-cooling-fan-reason-for-revision-add-rohs-cooling-fan.html
SR4850HW4, PCN 106253-00, Product Material, CLASS 2: Change to RoHS power supply and RoHS cooling...
Server Boards and Platforms, Product Material, Intel anticipates no impact to customers, see PCN detail for further information.