For example the i7 4790k I used in this experiment operates at a default frequency of 4.0 GHz, and the turbo boost raises the first two cores’ frequencies to 4.4 GHz when it’s necessary. Also usually, it raises the frequency of just the first two cores instead of all. So it can, just like the EIST, cause inconsistent results while overclocking. System load, active cores, estimated current, power consumption and the core temperature are taken into account in the boosting process. Intel Turbo Boost: It raises the clock frequency of the processor to a manufacturer defined turbo speed.For example EIST adjusts the clock multiplier of the processor I used in this experiment, the i7 4790k, somewhere between 7-47 and the voltage somewhere between 0.10-1.27 V according to system load. This is why it can result in inconsistent results and system crashes while overclocking.
Working together with the C-States, EIST tries to figure out the right frequency that you need at that exact moment through raising or lowering the clock multiplier and also adjusts the voltage accordingly to save even more power. It saves power and cools your processor by dynamically changing the clock frequencies. EIST (Enhanced Intel SpeedStep): This is a feature that Intel has been using since Pentium III.What are EIST, Intel Turbo Boost, Enhanced Turbo Boost and the C-States, and what’s their function? Let’s get you familiar with these features and what they do before we get to testing.ī.
If you try to overclock with these features on, you might have certain stability issues, especially in the voltages department. You should disable features like EIST, Turbo and C-States in your BIOS while you’re overclocking (while you’re playing with your CPU’s frequency, voltage and so on). This work focuses on said features’ advantages and disadvantages after the overclocking is done and a frequency/voltage balance is set. I have to point out something before I begin, in order to eliminate any possibility of confusion. Does enabling EIST and the C-States after you are done with overclocking cause any performance impairments or other problems? Should they be enabled or not? We’ve managed to reach a conclusion by measuring performance with both purely raw performance oriented (Cinebench, PerformanceTest etc.) and real-world oriented (Final Fantasy XIV, GTA V) benchmark tools.
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