Hey Splave, I noticed a couple issues in your screenshot.
CPU-Z is showing 6 GB or ram, but tweaker is only showing 2.
Also the RTL is showing 0, this indicates the cpu isn't recognizing all the ram. I had the same thing on my P6T. For me it was usually too little v-dimm.
Causes I know of are:
-Not enough v-dimm for the speed or timings
-Poor pin contact in the socket
-Bad IMC (God forbid)
-Moisture in the Dimm slots (I found this out today, it's really humid here)
The other thing is the refresh interval. I think this number should be lower. I believe it is determined by memory strap selection in the bios.
I'm not sure exactly what it's called. As soon as my board dries out, I'm gonna do some testing to find out how it is affected.
This is likely enough info for you to trounce my score quite handily.
I had a 20.98 run completed, only to notice my uncore was sitting at 4209. Bitch.
