Windows 10: Task Manager showing Intel Core i5-2500K operating at 5.29GHz??
Just checked my BIOS.
EIST was already turned off, and I'm pretty sure it's been off since 2011, when I bought this CPU. My temperatures never exceed 30*C when idle. Can you clarify what you mean? What exactly does EIST and Turbo Boost do? I'm currently running at 4.5GHz (I overclocked a bit more yesterday) @ 1.375volts. The voltage seems a bit high for a SandyBridge based processor, but I'm using fan cooling so I'd rather not exceed 4.2GHz anyway.
Intel introduced EIST about a decade ago. It means on idle you are clocking in at the lowest available frequency which in my Core i5-4300u's case is 0.8 GHz. This helps tremendously in saving power especially on laptops and mobile devices. It doesn't harm the performance at all since the CPU will clock back to its normal/overclocked frequency when there's a CPU load. Turbo Boost is Intel's dynamic overclock where the CPU is forced to operate at its TDP in any given CPU load. For example, if you have a dual core CPU, the only way to achieve the TDP limit is to have a full load on both Cores, so running full load on one core while the 2nd core is mostly idle will take approximately 60-70% of CPUs TDP. Therefore, to reach CPU's TDP with only one core loaded, one of the CPU cores must be temporarily overclocked to about 50-150% (depends on the CPU model) to reach that TDP on only one core.
For example, my Core i5-4300U has a normal frequency of 1.9 GHz with Turbo boost to 2.6 GHz on both cores (about ~90% CPU usage on both cores).
idling at 0.8 GHz, 35 degrees Celsius, 1.5 Watts power use.
Both Cores loaded at ~90% CPU usage
2.6 GHz speed, 73 degrees Celsius core temp, ~15 Watts power use (TDP)
Thank you so much for the information, but I have a question... Why does my (very) old laptop with a Pentium M 740, which is a single core clocked at 1.73GHz, clock at 700MHz at full load when EIST is turned off? Interestingly enough, according to Windows 10's task manager (yes, Windows 10 does run on it!!), it idles as 1.0GHz instead of 700MHz when EIST is enabled. Is it just because W10 is more demanding than XP, which is what the laptop originally came with?
It seems like that is due to power management from BIOS / Windows to me. In my experience when EIST is disabled, dynamic frequency is also disabled so if the BIOS or Windows is limiting power use, the CPU won't operate on its highest speed and won't slow down to its lowest speed. For example, if plugged in, if the CPU supports 800 - 2900 MHz frequency, with EIST off and power saving feature is enabled, CPU will get stuck at 800 MHz (there are many cases of this on google search). On the other hand, if EIST is off, "C state demotion" is disabled and Windows/BIOS power saving feature is disabled, CPU will always operate and get stuck at 2.9 GHz. In short, EIST just disables dynamic clocking (frequency won't chage) and it doesn't care what CPU frequency the chip is at currently.
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