I noticed that the CPU multiplier was dropping to from 47 to 45 on different cores while playing some games, like TW: Warhammer II, which results in lower clock speeds on some CPU cores during gameplay. Oddly, this rarely happened during CPU benchmarks.
In my BIOS, I've set the CPU multipliers to 47 (all core setting).
I've found that the 'Auto' CPU multiplier setting results in crashes, presumably due to the higher clock speeds (upto 5.1Ghz), and possibly insufficient voltage.
The best option for the CPU voltage seems to be to leave it on 'Auto' and enabling the TVB (Thermal Velocity Boost) feature, which seems to moderate the voltage (and power) of the CPU, even during very intensive processing, like the AVX/AVX2 CPU instructions found in Prime95.
I also disable Hyperthreading, to reduce overall power draw, which reduces temps significantly.
So, the BIOS settings to fix this issue are:
1. Set the board power manually to 150w for the 'CPU Core Current Limit' option (By default this is set to 'Auto', which I think probably limits the VRM max power to 125w).
2. Enable the 'Dual Tau Boost' option, which increases the max CPU PL1 power to 125w on this CPU. After doing this, the CPU core multipliers vary between 46-47 during gaming.
I don't know if it's possible to fix all the CPU multipliers to 47, but I'm happy enough with this anyway. Doing this doesn't seem to increase the CPU core temps.
Tip - You can monitor the CPU multiplier for each CPU core during gameplay, using software such as Speccy.
UPDATE - I also tried limiting all CPU multipliers to 46, and they remain constant at this multiplier during gameplay, with the same power limits as above. So, I'm pretty sure the motherboard can't quite supply enough power for 4.7ghz on all cores, constantly.
In my BIOS, I've set the CPU multipliers to 47 (all core setting).
I've found that the 'Auto' CPU multiplier setting results in crashes, presumably due to the higher clock speeds (upto 5.1Ghz), and possibly insufficient voltage.
The best option for the CPU voltage seems to be to leave it on 'Auto' and enabling the TVB (Thermal Velocity Boost) feature, which seems to moderate the voltage (and power) of the CPU, even during very intensive processing, like the AVX/AVX2 CPU instructions found in Prime95.
I also disable Hyperthreading, to reduce overall power draw, which reduces temps significantly.
So, the BIOS settings to fix this issue are:
1. Set the board power manually to 150w for the 'CPU Core Current Limit' option (By default this is set to 'Auto', which I think probably limits the VRM max power to 125w).
2. Enable the 'Dual Tau Boost' option, which increases the max CPU PL1 power to 125w on this CPU. After doing this, the CPU core multipliers vary between 46-47 during gaming.
I don't know if it's possible to fix all the CPU multipliers to 47, but I'm happy enough with this anyway. Doing this doesn't seem to increase the CPU core temps.
Tip - You can monitor the CPU multiplier for each CPU core during gameplay, using software such as Speccy.
UPDATE - I also tried limiting all CPU multipliers to 46, and they remain constant at this multiplier during gameplay, with the same power limits as above. So, I'm pretty sure the motherboard can't quite supply enough power for 4.7ghz on all cores, constantly.
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