Overclocking

Overclocking the Radeon RX 6600 is quite complicated, just like the RX 6600 XT. You must increase the power limit or you won't see any performance gains, or even have negative scaling. Since RDNA 2, it is no longer possible to dial in a specific frequency; rather, you adjust the minimum and maximum target frequency range, which still is no guarantee, hence "target." The problem is that the clocks will not change if the card is limited by power. As such, you have to dial up the power limit to gain the necessary headroom for the overclocked frequencies to activate.

AMD has limited the length of the overclocking sliders, so you'll basically go as high as possible on power and memory as the card will still be stable, which means some overclocking potential is lost due to AMD's limits.

For GPU overclocking, the situation is similar, but I found that maxing out both the minimum and maximum clock resulted in negative performance scaling. My best overclocking performance results were with the "max clock" slider at the maximum and the "min clock" slider slightly below. It took repeated benchmark runs to find the sweet spot.

Overclocked Performance

Using these clock frequencies, we ran a quick test of Unigine Heaven to evaluate the gains from overclocking.


Actual 3D performance gained from overclocking is 6.5%.