The Lenovo 94Y8144-RFB 750W power supply is a refurbished server replacement part for supplying power to compatible system hardware. Its 750W rating identifies its power class, while the corresponding Lenovo 94Y8144 unit is specified as 80-Plus Platinum and hot-swappable.
The 94Y8144 is listed for the x3650 M5 server, with an input rating of 200–240V AC, 4.2A and 47–63Hz. This listing identifies the RFB version as refurbished. It is a practical replacement component for a supported server configuration that uses this part.