When overclocking the GameRock Premium, we used Thunder Master – Palit's GPU overclocking utility. We maximised the power limit and temperature target sliders before adding +45MHz to the GPU core and +800MHz to the memory.
Obviously +45MHz to the GPU core is not much, but bear in mind the card is already 75MHz faster than the Founders Edition, so manual overclocking headroom is limited. You can think of it as +120MHz faster than Founders.
3DMark and Games Testing
That overclock netted us an extra 5% graphics score in Fire Strike, while we saw frame rates rise between 3-4FPS when playing Far Cry 5 and Shadow of the Tomb Raider at 4K.