I took a chance because they were new and bought these two 32GB memory modules. They have not been tested by ASRock, which so far has only recommended a 32GB module, which is not yet available. First I removed 2 16GB modules and left the others with 2. I didn't want to buy 4 if those two didn't work. The computer did not start. After reading the MB menu, I removed the 2-16GB modules and replaced them with 2-32GB modules only. It booted and I got 64GB of total storage. Then I put 2 x 16GB modules in the empty slots and now I have 96GB in total. I will be buying another set of these and 128GB total. Very happy.
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