This is the last I'll post on this thread,
The ASUS thread:
http://rog.asus.com/forum/showthread.php?35490-Sabertooth-Z87-Bios-Clock-Issue
goes through many scenarios and users with similar date problems on ASUS z87 boards. Many users reset the CMOS over and over. Jim's statement "to open up your case and push the CMOS button on the MB for 4 seconds and the problem is fixed - 100% of the time." is sadly enough, not 100% accurate. My Sabertooth Z87 does not have a CMOS Reset button, it has a Jumper connector (3-pin CLRTC). The motherboard manual discusses clearing the CMOS with all power off. This is the simpleist and safeist place to start. It did not resolve the problem for me. Contacting ASUS, reading , and logically and gradiently approaching the problem HAS resolved the issue (knock on wood.)
In the thread with Raja@ASUS, the next step to "fix" the problem was resetting the CMOS in standby mode by using the Clear RTC RAM jumper. Many times this re-set the Intel Interface Management Engine and solved the problem, other users were not so fortunate and this was not the fix for their system.
Reflashing the UEFI (BIOS) and installing the updated Intel Interface Management Engine driver (from the ASUS support site.) "resolved" the issue for many, but not all. Long story short -- start simple, and logically work your way up. Utilize ASUS Support. With my board clearing the CMOS (as suggested by Jim) worked briefly, but was not the solution. So far, the updated Intel Management Engine driver and the UEFI (BIOS) update has "apparently" handled the issue, although it has only been about a month.
It seems that the issue is not just a single simple solution to all. The newer UEFI (BIOS) is apparently still is in its evolution with the higher end motherboards, and this issue is not just a simple "one cause, one fix".
Don
