For our temperature testing, we measure the peak GPU core temperature under load. A reading under load comes from running Cyberpunk 2077 for 30 minutes.
Out of the box thermal performance is no problem for the Twin X2 either, it runs slightly cooler than the Founders Edition – we're talking less than 2C difference – though it is a few degrees hotter than the JetStream OC. Of course, the Twin X2 is also a fair bit smaller, so that will have to be taken into account, but there's nothing to worry about here.