HWMonitor is unreliable for power draw readings. There was a big thing when a miner claimed he was able to undervolt and get Vega down to an unrealistically low amount of power, and that reported figure didn't match up with the known accurate readings from the P3 Kill-A-Watt. Here's a good example. Using AIDA64, HWMonitor, and ASUS AI Suite to obtain CPU power readings, all three come up with different figures.