Look at the BIOS screen where the CPU multipliers are located. They're probably all set to "auto" right now. You can change that to manual. I know my AsRock BIOS also has an option to set multipliers "per core" or "all core" right so by selecting "all core" I only have to type in one number (41) for my 3570K to run 4.1GHz on all cores but I can accomplish the same result setting the 4 multipliers individually to 41 also. I can't remember if Gigabyte has that option, but I could check tonight, I know my Gigabyte Z97 board came default with MCE turned on, so it's running that 4690K at 3.9GHz on all cores. Most/all manufacturers have now been pressured to leave MCE off by default nowadays.
MCE does not break Speed-Step. Both my systems will still idle.
Leaving the voltage set to Auto is going to allow the mobo to add voltage when you increase the multipliers above stock (which most will). It's pretty well understood that mobos tend to add more voltage than what's needed. There's multiple ways to circumvent this, the easiest way I found was to set a very small voltage offset on my AsRock board. That essentially prevented the mobo from juicing the chip, so my OC is at stock voltage. Just do a Prime95 run with CPUz open before you start OCing and write down the voltage you see at stock.
That said, IIRC the 8086K was pretty juiced and binned to get to the 5GHz single core turbo speed and that it actually matches the 8700K clocks when you have >1 core loaded (reference
). Depending on your luck in the chip lottery, OCing the higher core count chips to a single "all core" turbo may not be as efficient as having even a single multiplier step (say 4 multipliers at 5GHz and the other 2 at 4.7GHz). Of course, that all depends on how advanced you get with voltage adjustments. I wouldn't expect to get 5GHz an all 6 cores at stock voltage.
Last edited by DPete27
on Fri Oct 12, 2018 4:51 pm, edited 1 time in total.
Main: i5-3570K, ASRock Z77 Pro4-M, MSI RX480 8G, 500GB Crucial BX100, 2 TB Samsung EcoGreen F4, 16GB 1600MHz G.Skill @1.25V, EVGA 550-G2, Silverstone PS07B
HTPC: A8-5600K, MSI FM2-A75IA-E53, 4TB Seagate SSHD, 8GB 1866MHz G.Skill, Crosley D-25 Case Mod