AsRock Bios Settings For Best Overclock
(These Settings Are Just General Markers. All CPUs Are Slightly Different)

ASUS z490 BIOS Guide

If You Want To Increase The CPU Cache Above a Certain Threshold You Have To Increase The CPU Voltage More. Some Boards Have Separate CPU & Cache Voltage Options. VCCIO Also Helps for Cache OC, RAM OC Too. After Chache of 4.6Ghz My Board Needs More Voltage. For You That Could Be a Different Cache Frequency. 


Set FCLK At The Beginning Or The End Of The OC When You Found All Other Settings. It Could Want Slightly More RAM Voltage or VCCSA & VCCIO. Depends How Good is Your Memory Controller & How High Is The OC.



Here Except CPU Voltage Offset, LLCalibration, PCH Voltage & CPU Internal PLL, The Other Voltages Are For RAM Overclocking. Dont Use Higher That These For Every Day Use. Only If You Want To Squeeze The Best Of Your System & Willing To Take The Risk. You Can Increase VCCIO & VCCSA up to 1.300-1.350mv MAX (with good cooling) But On This Platform I recommend 1.2-1.25v, maybe 1.3v on High-End boards. Use Lower Values On Low-End Boards. Its Up To You Whether You Want to Risk. Be Careful With These Voltages, You Can Break Your Mem. Controller or VRM.



If You Have SSD Make Sure You Optimise It For That



HPET Enabled in BIOS & Disabled in Windows. If you have bad performance, you probably used the wrong bcdedit commands. Disabling in BIOS or in Windows will fix it. One of both (Windows or BIOS) has to be disabled. I Recommend Enabled in BIOS.


These Settings Will Skip Some Security Checks You Dont Need All The Time. That Way You Will Boot To Windows Faster. Sometimes boot on USB Flash Drives Might Not Work. So Disable If You Need To Use USB Flash Drive. Ultra Is Fastest BUT You Cant (very hard) Go In Bios With Del or F2 keys With That Option. The Only two Ways Are To Clear C-Mos (this will reset your OC) Or With RestartToUEFI Tool or Use My GPU Booster Program Which Has an Option to Boot Straight in UEFI/BIOS. Fast Is More Convenient but slower boot.
Dont listen to those people who tell you to disable it. They just read Google & dont know better. There is no other real downside. Disable only when you install new Windows & have a problem locating a USB drive.


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