A:Answer Hi Josh. Thanks for the questions. HP uses proprietary power supplies with a different type of connector. This Desktop PC has the L81008-800 - 180W power supply installed. This chassis can also use the L64961-800 - 310W power supply, and the connectors should be the same. I hope this helps you. The motherboard has 2 memory slots. One is taken up by a 16GB module, leaving the other one free to add another 16GB module. Memory upgrade information
Dual channel memory architecture (One DIMM per channel)
Two DDR4 UDIMM (288-pin) sockets
Supports up to PC4-25600 (DDR4-3200)
Supports 4 GB and 8 GB DDR4 UDIMMs
Supports up to 32 GB (unbuffered) with two 16 GB DIMMs on 64-bit systems
Here are the system specs. You can click on the motherboard specs to see details of the entire system:
https://support.hp.com/us-en/document/c06955922