I was running 1 crystalMark benchmark, but I didn't pass through 400GB in 8 minutes or so.
Then before I posted this thread, I made another change to cache settings. I increased the L1 cache again to 4096MB. After clicking ok to adjust settings, it appears as if the cache disabled itself. I now had 0 cache. When I ran a benchmark test (crystalmark), it was back to the slow speeds of before.

I then tried to change the settings again, but after getting the confirmation message that the new settings have been applied, I still see that the cache is 0.....nothing was changed.
Definitely a bug.