108.4% here would mean a max draw of advertised TDP (175W for the 2060 Super) * 1.084 = 189.7W. Power consumption is a percentage figure of how many watts is being drawn compared to what the card is advertised as.

Many people do this to reduce noise and overall temperatures. This might be perfectly acceptable if your plan is to undervolt and keep the card cool while losing some performance. Or if your temperatures are fine (under 88C if you've overclocked, under 82C if not) then it might say 'Power', which means it doesn't have enough voltage to boost higher or the power limit is not set high enough.

If you're not watercooling, and you're in a game, it'll most likely say 'Temperature', because it cannot boost higher because the temperature is too high. In the screenshot the reason is 'Idle', as in there's no load so there's no need to boost. PerfCap reason is a report of what's 'holding the card back', as in why it's not boosting the clocks higher. But in return you would get max performance out of the card. You could safely put voltage to max there and face no problems, except increased temperatures. NVIDIA has put in a hard cap of 1.093v on the Turing cards (2000-series) which is very safe, so there's no real reason to be worried about it unless it's running below what you want it to. The more is pumped in, the faster it can run, but also increases temps and beyond a certain limit can degrade lifespan. Voltage is again 12.3V, which is consistent with the PCIe voltage, good. The PCIe slot itself can also supply upto 75W. Voltage is 12.3V, which is within margin of error of 12V. Max power draw of a PCIe 8-pin connector is 150W, and you've maxed at 137.1W there, so you're fine on that field.

Gpu z power consumption