Have tried RB 5.2ghz but am up to 1.4v and not quite there yet. Will settle for 5.1ghz Realbench 8 hours 1.325v. glnn_23 - 7700k - L639F976 - 1.21v ? - Asus Max VIII Ranger - G.Skill 3600C15 - 5100/4500 - 1.325v(in bios) Click to view full size! Also ran Google Stressapptest in Linux Mint for 4 hours at same settings to check memory stability. GSkill 4266c19 on this cpu/mb combo seems limited to 3600c15 at these volts. Click to view full size!