Overclocking

Overclocking the Radeon RX 6600 XT is quite complicated. You must increase the power limit or you won't see any performance gains, or negative scaling. Since RDNA 2, it is no longer possible to dial in a specific frequency; rather, the minimum and maximum target frequency range is adjusted, 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.

Memory overclocking is complicated by the fact that these chips have error correction. So if they are unstable because the overclock is too high, there won't be crashes or rendering errors. Rather, the memory will keep trying to replay the transaction, which results in correct output eventually, but at much lower FPS. You'll have to experiment with the memory overclock until you find the sweetspot where you've still gained performance.

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 9.2%.