Fixed my stability problem. :D
The cause of my troubles is the pencil mod. I gently wiped it off with a small paint brush and blew out my case.
Now it's stable running again at 4.05GHz and DDR 1199MHz with tRD 6 and tREF at 16120T with the same settings that I was using with BIOS 0902.
Prime95 custom blend amount of memory used 3200MB.
http://i431.photobucket.com/albums/q...D6-tREF161.jpg
EVEREST Cache & Memory Benchmark.
http://i431.photobucket.com/albums/q...RD6-tREF-5.jpg
Small gain than using a refresh period of 16383T with MemSet.
Also running fine in Ubuntu 64 bit so I can say that it's possible to use a refresh period of 16120T for 24/7. :up: