Overclocking Tests
Overclocking is done by increasing the voltage to 1.35V and CPU multiplier until the chip can no longer complete the Blender test. We imagine that 5.1-5.15GHz is the variation between all Z490 boards; it's a CPU ceiling more than power delivery limitation.
4,900MHz is a decent return from a high-frequency pack of Corsair Vengeance LPX memory, too.