New clock multiplier now available.
New clock multiplier now available.
You're experiencing higher overclock performance because you adjusted the Boost Multiplier setting in BIOS to 37, which allows your CPU to run faster than the default limits. The increase from 3.9GHz to 4.1GHz suggests the processor is now utilizing more voltage or thermal headroom under those settings.
However, I still receive a 4.1/3.9ghz measurement on XTU and CPUZ, and I also see better frame rates in CSGO that rely more on the CPU than the GPU.
Intel's third generation processors included a capability known as limited overclocking, allowing boosts of up to four multiplier increments. Typical configurations ranged from base speeds like 3700 MHz with one active core to higher tiers such as 4100 MHz with three active cores. The fourth generation desktop CPUs removed this feature. Your current 4th generation mobile Core i7 supports only a two-bin overclocking range. The 4800MQ model offered four bins, while the 4900MQ provided six bins.
Theoretical limit suggests 4 cores should hit 3.9 GHz. You can share an XTU capture during full CPU load with the built-in stress test or benchmark.