Asrock Z77 Extreme 4 Processor/Memory OC Question

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I have a I-5 2500k Intel Processor in a Asrock  Z77 Extreme 4 motherboard running WIN 10 Pro 64 Bit.  I have stable OC running at 4.2mhz.  In Bios Version 2.09, should I choose OC b "per core" or "all cores"??  My PC shows that not all cores are at 4.2mhz.....  Is there anything in the bios I should definitely turn off??  I also bought 2/8gb Corsair Evtreme Pro DDR3-2400 RAM Memory for my Asrock Extreme 4 MB.  The manual says it can use up to DDR3 2800.  The bios however only gives me the option for up to 2133.  Any Ideas???

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Uberterrific Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 15 Sep 2015 Location: Texas Status: Offline Points: 3	Post Options Post Reply Quote Uberterrific Report Post Thanks(0) Quote Reply Topic: Asrock Z77 Extreme 4 Processor/Memory OC Question Posted: 15 Sep 2015 at 12:08am
	I have a I-5 2500k Intel Processor in a Asrock Z77 Extreme 4 motherboard running WIN 10 Pro 64 Bit. I have stable OC running at 4.2mhz. In Bios Version 2.09, should I choose OC b "per core" or "all cores"?? My PC shows that not all cores are at 4.2mhz..... Is there anything in the bios I should definitely turn off?? I also bought 2/8gb Corsair Evtreme Pro DDR3-2400 RAM Memory for my Asrock Extreme 4 MB. The manual says it can use up to DDR3 2800. The bios however only gives me the option for up to 2133. Any Ideas???

parsec Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 04 May 2015 Location: USA Status: Offline Points: 4996	Post Options Post Reply Quote parsec Report Post Thanks(0) Quote Reply Posted: 15 Sep 2015 at 1:48am
	Use the All Cores option, which has one core multiplier setting. Set that to 42. If you use the Per Core option, you must set each core multiplier to 42 manually. You must have Turbo enabled for any OC to work. Nothing needs to be disabled. About your memory, did you try to enable the XMP option? Does your BIOS have a DRAM Reference Clock option? Setting that to 100MHz or Auto should give you more frequency choices. I assume you are using BIOS 2.90, not 2.09, right?