https://wccftech.com/msi-radeon-rx-5600-xt-gpus-14-gbps-memory-speed/

In the latest MSI Insider podcast, the hosts Eric Van Beurden and Pieter Arts had a discussion saying that not every single Radeon RX 5600 XT graphics card can run its memory at 14 Gbps. These cards received a vBIOS update that increased the GDDR6 clocks up to 14 Gbps.

The RX 5600 XT graphics card has GDDR6 memory chips, which are validated to operate at 12 Gbps, although some of those memory chips may be able to overclock to operate at 14 Gbps. MSI stated that they could not guarantee its RX 5600 XT graphics card's longevity and stability at 14 Gbps, this is because overclocking can potentially hurt the components as these chips were not designed and tested for that speed.