Yes, it's possible to both overclock and undervolt simultaneously while maintaining stability.
Yes, it's possible to both overclock and undervolt simultaneously while maintaining stability.
With a solid chip, you can achieve this setup. Running a 4670k at 4.2GHz, 1.07v, while stock clocks were around 1.15v.
I can adjust both of my boards—4790K and 6700K—to around 65-70W at normal speeds by using undervolting. I haven’t experimented much yet with frequencies in that range, but between those and the highest stable overclock I’ve managed, it works. For the 4790K (Z97 Extreme6), it reached 4.7 at 1.25V and 4.8 at 1.35V. I probably was close to 4.0 or 4.2 at voltages between 1.0 and 1.05V or with small voltage offsets of -150 to -200mV. The 6700K (Clevo P750DM-G) improved slightly with undervolting at stock speeds, but I only reached about 4.6 GHz with the overclock. A couple Cinebench runs at 4.7 gave similar results, though no noticeable gain. The system was already getting hot—reaching 100°C during the test—and a 5mV reduction would have caused a BSOD shortly after starting a heavy load. I’m curious who else has achieved such close performance, especially in extreme cooling conditions like water or even liquid nitrogen. (When the temperature drops below 60°F this winter, and I’m using the high-speed fan next to the freezer in the laundry room early morning, what would be the limits?)
In old days with AMD Barton, I owned an Athlon XP 2500+ (1833Mhz) that could hit 2400Mhz with a big overclock. It depends on the "silicon lottery," but running modern CPUs is more limited.