well i have tried the F4 bios now...
I also was able to finally use the XMP setting successfully for the first time
seemed fine at first...but then i started having app crashes and other typical memory issues (general bugginess)
i just dont think this particular set wants to run at 2133 stable without alot of work
so i reverted back to my old settings, but then my latency and memory bandwidth benchmarks were not as good as before
so i wound up reverting to F3u :p
now everything is back to normal (f3u is a little higher memory bandwidth than f3t , with .1 ms increase in latency only)
unless something changes i am here to stay :p
bios: F3u 9-10-9-24-128 1T 1866mhz 1.65v
benchmarked using Sisoft Sandra Lite
thanks for the news...good luck with your setup
P.S. i dont have any temp reading issues here that i have noticed, but i forgot to check while on F4 :p