All 80+ certified PSUs deliver 80% efficiency at a specified load (mentioned above). But there are a few more variations to this. Another thing to note is 80+ PSUs also have further brandings such as 80+ bronze, silver, gold, titanium, and platinum. The difference between all of these...
Ryzen 5 5600 CPU, Gigabyte B450 I AORUS PRO WIFI mITX motherboard, PNY XLR8 16GB (2x8GB) DDR4-3200 CL16 RAM, Mushkin PILOT 500GB SSD (boot), Corsair Force 3 480GB SSD (games), XFX RX 5700 8GB GPU, Fractal Design Node 202 HTPC Case, Corsair SF 450 W 80+ Gold SFX PSU, ...