That is indeed a quite high temp.....(certainly no room for overclocking)
Either the cooler is not quit locked down, too much/not enough paste, or, the cooler might not be adequate, assuming your core voltage is not abnormal ....
my Asus board applies .729 Volts when just loafing at 800-1000 MHz, and, when ramping the clocks to all core turbo, as high as 1.276V is applied (per HWMonitor) which is enough for stable all-core turbo at 4.7 GHz with the Noctua NH-D15 (the D15 requires 165 mm mounting height clearance...)