XFR2 and Precision Boost Overdrive clocks are based on your PC configurations ability to provide power and low temps during boost. So max boost will be reflected accordingly.
What are your minimum and maximum voltage readings on HWmonitor (HWinfo64 is much better), both idle and load? What Clock frequencies are you seeing at idle and load(min&max). Prime 95, IBT AVX(FX version) or Cinebench R15 can be used.
Are you using both CPU power connections 8+4 pins?
PSU? Brand and wattage?
Is your CPU cooler seated properly?
Are you running the latest BIOS F4G?
Make sure that XFR2(core performance boost) and Precision Boost Overdrive are enabled in your BIOS.
ok, so the bios is up to date (F4G),
i got into the bios and made sure that core performance boost is set on Auto (can't set it to Enable), and made sure that Precision Boost Overdrive is set on Enable instead of Auto and here is the new readings from HWinfo64 with the polling period set to 100ms:
voltage idle: min=1.381v max=1.469v || Clock idle: min=4099mhz max=4199mhz
voltage load: min=1.288v max=1.469v || clock load: min=3998mhz max=4199mhz
for the clocks it's better than before (4050mhz) but i still can't see that 4.35ghz which is so sad
for the connectores i use 1x 8+4 and 1x 4+4
the psu is Evga 750W G3 GOLD
and for the cooler yes it's mounted properly i made sure multiple times and the temps are the same
That voltage should be enough for max boost and is in line with the voltages reported by users at overclock.net, they report 1.45v-1.5v max vcore for stock settings with XFR2 and PBO enabled (mine is 1.48v R5 2600x). With the configuration listed and a updated BIOS, XFR2 & PBO enabled you should be seeing max boost if temps and power allow (sounds like they are). You could try the R7 2700/2700x Owners thread at Overclockers.net there are some owners on the thread that use the same motherboard and they might provide some more insight to your issue.
ok thank you very much