Very little about this kit (FF3D532G6400HC38JDC01) was available, so I took a gamble on it being Hynix as it was free anyhow, but alas it is Micron. Read/write bandwidth seems quite good for single rank, single CCD. It is an older version of AIDA, so I'm not sure if that impacts it – probably not.
Still need to do some more tuning, but this kit can be improved some at least. Given all of the 9800x3d dying, I'm limiting VSOC to 1.2V. With this limit, I wasn't stable 1:1 at 6400, so went to 6200 for the kit. Lowered to CL34, maxed tREFI, and used 806 tRFC from https://www.hardwareluxx.de/community/threads/ryzen-ddr5-ram-oc-thread.1324121/
Aside from these, I turned on "Low latency" in my BIOS settings. Will eventually replace with Hynix A, but it's good enough for now.
I was also able to get the kit to be almost stable at 7600 CL42, passing stability tests and then it would randomly fail one several hours later. I could boot at 7800 CL42, but it was unstable, and I haven't messed with it yet. 6200 1:1 +2200 fabric is faster, so I'm not sure if it's worth wasting time on it.
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Read speeds is VERY good for 6200MT/s; almost unbelievable.
In fact single CCD should be limited to 64GB/s Read at 2000FCLK.
Edit: Something funky is going on.