Has anyone been successful installing ram higher than the stated 5600 mhz limit?
No one outside of reviewers have gotten AMD Frameworks. You can install higher speed ram but it’ll just default back to 5600 because that’s what AMD’s specifications are. Only if you use soldered memory can you get higher speeds.
The JEDEC-5600 configuration will still be used to boot up, and the only thing you can do is to choose a Class A JEDEC timing level product (5600CL40).
Note that such tight timing products are not officially supported by the Framework!