Single-monitor desktop power consumption is very low with only 4 W. Multi-monitor power consumption is almost five times as high, which has been an AMD problem since forever—when multiple monitors are connected, the memory will run at full 3D speed, which drives up power consumption. 18 W is not nearly as bad as the 35 W on the RX 5700, probably because fewer memory chips are used, and they are not clocked as high. What's interesting here is that VRAM size has no effect on multi-monitor power consumption; it's the number of chips that counts (compared RX 5500 4 GB vs MSI RX 5500 XT 8 GB).
Media playback power consumption is increased quite a bit though, maybe the memory makes a difference here.
Gaming power consumption is extremely reasonable with around 120-140 W, slightly higher than the 4 GB variant because the additional memory draws some extra power. When I saw the 8-pin power connector, I was worried. After seeing our test results, I'm not even sure why they didn't use a 6-pin. At those power consumption levels, the card will run with any power supply. People upgrading their OEM system, which often use PSUs of questionable quality, should have no problems running this card.
MSI's factory-overclocked increased power draw only marginally, even though we see that Furmark can indeed go up to 180 W, which kind of justifies the use of an 8-pin power connector and also ensure there's enough power headroom, if needed.
Recommended PSU: 400 W