Just to share my numbers:
XFX RX 5700 XT THICC III
out of the box: 49.x MHs
settings to reduce power consumption and a bit of OC (no bios mod)
Core Clock, Mhz = 1400
Core Voltage, mV = 790
Memory Controller Voltage, mV = 790
Memory Clock, Mhz = 1800
Memory Voltage, mV = 1350
Fan, % = 65%
Results:
51.17 MHs
Core 44 Celsius degrees
Mem 62 Celsius degrees
Power consumption 112 watts
Is power consumption measured at the wall or software? If software you need to add an extra 30 or so watts being drawn from the pci-e slot that isn't reported. I have my core voltage all the way down to 725mv but total system power consumption at the wall is around 180w (single miner rig, with not the most efficient motherboard and cpu (ddr3)). Around 35-40w of that is the base system and case fans. I have another single gpu rig with a single rtx 3060 ti (again lots of case fans but this time with ddr4) and that does around 168w at the wall. I am working on making both more efficient but I can't adjust the memory voltage down on the rx5700xt because it's setup in windows at the moment. Apparently you can access this in HiveOS so I'm going to create a dual boot and see if I can get the wattage down further. Annoyingly you have to mine on HiveOS mining pool or you incur a $3 per month cost (currently using Ethermine) but I will give it a go