This simple process is done through the UBU tool and instructions found in this guide. I take no responsibility for failed BIOS flashes. If you don't feel comfortable with this, don't attempt it. I even found 5GHz to be within stable reach.ĭISCLAIMER: This involves flashing your motherboard with an edited BIOS. For some this is enough to increase their clockspeed beyond what was possible before, for others it means running the same clocks at lower voltages and temperatures.įor me, I went from 4.7GHz to 4.8 at the same voltage of 1.3v, and got, a clockspeed that originally crashed with my motherboard BIOS' stock microcode 19 on starting a x264 stress test. Reported voltage reduction for a given clockspeed varies from 0.04 to 0.01v with an average of 0.02v, depending on CPU and initial overclock stability. So far this has been replicated multiple times by myself, LostParticle, To update your BIOS' microcode and try for yourself, follow the simple steps in the spoiler below. I found this out accidentally, but have found the improvement over previous microcodes to be 100% reproducible, and another user has posted similar results. Summary: The latest CPU microcode 22 (released in 2017) improves overclocking for Haswell over previous microcodes. I made posts in various threads on this topic but have decided to make a thread to keep information and testing from getting buried. Hello fellow Haswell/Devil's Canyon overclockers!
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