For our temperature testing, we measure the peak memory temperature under load. A reading under load comes from running Metro Exodus Enhanced Edition for 30 minutes.
Memory thermals aren't quite so competitive, with the Performance BIOS at 66C and the Silent BIOS at 68C. Those are still very good results, but are only small improvements over the Founders Edition – but once again, it's hard to argue when the temperatures are this low to begin with.