Bought brand new in March, so it was only used a few months. Voltages in bios were adjusted since new, to Intel's specs, to reduce any chance of instability. This CPU has exhibited no instability issues since new. I have also never overclocked this CPU. Recently performed ASUS bios update 2402, which also incorporates Intel's initial microcode fix for the reported instability issues. Of course, you should use your motherboard manufactures newest bios to add the same microcode update, which should be available for the Z690 and Z790 chips sets already, with the final code being released within the next few weeks. Selling due to switching my setup to a workstation. Product is still under warranty with Intel.