Samsung didn't just stop with making the chip faster and more power-saving. They also made a big improvement in how the chip handles heat. The new design of the chip means it's much better at staying cool, with a 70% improvement in getting rid of heat compared to the older GDDR6 chips. This is great because it means the graphics cards using this new chip will likely be more reliable and last longer because they won't get as hot.
Source: HardwareLuxx.de