I just yesterday switched from ASUS normal mode to ASUS optimized and changed my CPU fan settings to turbo (PWM). ASUS optimized clocked my CPU to 4.3 GHz turbo it seems, and it runs at 4.0-4.2 under load. I played games for over 4 hours while monitoring my CPU temperatures. I got max. 78°C while the majority of the time the temperatures were in the 60-70°C range.
It already booted slow after I changed the settings to optimized and the screen kept flickering, but it eventually booted up. According to task manager the last BIOS time was a little over 20 seconds instead of my usual solid 8.1 seconds. I thought that was normal since I just changed the settings. However, today in the morning I almost got a heart attack - it wouldn't boot! Both screens would stay in standby mode and I didn't even see the ASUS logo prompting me to press F2 to enter BIOS. I freaked. I tried restarting it a few times and eventually managed to get into BIOS. I saw the boot order had changed. In first place was my CD drive (?) and then I saw my SSD, HDD, and something about Windows boot.
I selected my SSD as first place and put Windows boot as 2nd place and managed to boot up, but it took ages again! Last BIOS time: 22.7 seconds instead of my usual 8.1 seconds. What could be wrong? Did ASUS optimized mode already damage my components? Also, what should the correct boot order be? Windows boot something or my SSD, where Windows is installed?
Edit: I now changed "Windows Boot Manager" to be the first boot device in the list. It boots normally now. What is really bugging me though is it says last BIOS time 12.4 seconds, which is 4.3 seconds slower than usual. Why does it boot slower in ASUS optimized mode?
Edit2: After I shut my PC down for 30 minutes with the power cord unplugged it did the same thing again. No ASUS startup screen, nothing. It was just idling until I pressed the restart button and got into BIOS settings. The boot order had not changed, Windows boot manager was still priority. After exiting BIOS it started up normally, although at the end of the ASUS loading screen the loading animation froze for one second before it was done booting up.
Operating system: Windows 10 Home 64-bit
Processor: Intel Core i5-4690K @ 3.50 GHz
Motherboard: Asus Z97-AR
RAM: 2x 4GB DDR 1600 MHz
Storage (OS): 240 GB Kingston Fury SSD
Additional storage: 1 TB SATA 3 HDD
Power supply: Coolermaster 600 W
Graphics card: ASUS Strix DirectCU II NVIDIA GeForce GTX 970
Edited by Yukinon - 2/4/16 at 7:59am