Rejoice! Base Clock Overclocking to Make a Comeback with "Skylake"
Since Intel fully integrated the core logic (northbridge) with its processors, overclocking them by tinkering with the base-clock (BClk, the primary clock domain from which the CPU's clock speed is set using multipliers), became unstable, as it was used as a cadence for other key components on the chip, such as iGPU and PCIe root-complex. Apparently, with its 6th generation Core "Skylake" processors, Intel has de-linked base-clock from other clock domains, re-enabling overclocking using BClk, which is particularly helpful on non-K (upwards multiplier locked) SKUs.
Some of the first motherboards that enable BClk overclocking on Skylake CPUs come from Supermicro, the server/workstation motherboard maker that's dipping its toes into DIY enthusiast platforms these days. "Dhenzjhen," an overclocker from the Philippines struck gold by achieving a 5.00 GHz overclock on a Core i3-6320 dual-core chip, using a Supermicro C7H170-M motherboard (which is driven by an Intel H170 chipset). Shortly after news of this feat broke, ASRock fired an email to the press, stating that its Z170 Extreme7+ motherboard is able to support 4.50 GHz clocks on a Core i5-6600 quad-core chip, using an experimental BIOS. ASRock is validating this BIOS internally, and hopes to release it "very soon."
Some of the first motherboards that enable BClk overclocking on Skylake CPUs come from Supermicro, the server/workstation motherboard maker that's dipping its toes into DIY enthusiast platforms these days. "Dhenzjhen," an overclocker from the Philippines struck gold by achieving a 5.00 GHz overclock on a Core i3-6320 dual-core chip, using a Supermicro C7H170-M motherboard (which is driven by an Intel H170 chipset). Shortly after news of this feat broke, ASRock fired an email to the press, stating that its Z170 Extreme7+ motherboard is able to support 4.50 GHz clocks on a Core i5-6600 quad-core chip, using an experimental BIOS. ASRock is validating this BIOS internally, and hopes to release it "very soon."