Question about Gigabyte GeForce RTX 4060 8GB GAMING OC

The graphics memory clock of 2 GHz (effectively 17 Gbps) is a standard value for many graphics cards in the RTX 4060 series, including the models from Gigabyte. This clock ensures balanced performance and efficiency when using GDDR6 memory. The memory clock is selected to fulfil the requirements of modern games and applications without consuming an unnecessary amount of energy.

Why does an RX 7600 xt, for example, have a graphics memory clock of 18 GHz?