Windows 10: Task Manager showing Intel Core i5-2500K operating at 5.29GHz??

Since I skipped Windows 8, I didn't get to use its new task manager.

But now that I'm on 10, I'm heavily enjoying this AMAZING new task manager.

However, I just noticed (not sure how I didn't see this before) that Task Manager is showing that my i5-2500K is running at 5.29GHz! I do have it overclocked to 4.2GHz @ ~1.31 volts. Does anyone know why this might be happening? I searched around a bit and I found that some other people have this problem with the i5-2500K and the Task Manager, but nobody really knows what it is.

Is this just Intel trying to get us to buy their new processors? *Think





:)

 

Lumia 620 doesn`t connect to computer via usb cable

My laptop is Acer Aspire V3-731, and my desktop is self assembled, Gigabyte GA-Z68-UD3H-B3 motherboard, Intel Core i5 2500K, Sapphire Radeon HD6850, 8Gb DDR3.

 

100% cpu usage windows 10

I have exactly the same issue with Core i5 2500K @4GHz.

Haven't found solution yet

 

That's funny - it's interesting that that it gets the "max speed" right, but the current speed so badly wrong.

My Win 10 TaskMgr is also getting my actual cpu speed wrong, but in the opposite direction.

I've got a trusty old I7-920 running at 3.5 (20 x 175) and from the speed ranges I'm seeing it's obvious that Win10 TaskMgr is not reading (or maybe not even attempting to read) the bus speed correctly. In my case it seems to be assuming that the bus speed is always stock (133) and the multiplier is fluctuating normally (12-20) with cpu utilization.

If TaskMgr is similarly misreading the bus speed on your system (and again using say 133 rather than 100), then with a multiplier of say 42 at full utilization it would read 5.5Ghz-ish. I think that sort of fits with what what you're seeing (given that in the graph you're on the way down from a 100% cpu spike)?

 

Mine is also doing the same with my i5-3550 says max speed is 3.79 GHz but reports 3.89 GHz.

 

Don't trust the numbers on it. My i5-4300U says Max speed is 2.5 GHz, but task manager reports 2.9 GHz for 1 Core and 2.6 GHz 2 core loads.

 

I have had mine show weird numbers too/ Mine is OCd to 4.5

 

Hmm, interesting.

Perhaps it only happens on older processors? I'm not seeing any 5th generation or 6th generation Core i5s or i7s with this problem

 

Nice Phase Change Cooling System *Smile

 

Intel processors have a "Turbo" function, which can temporarily increase the CPU speed (there is also the speedstep function which can drop the speed). It's likely that the code that calculates this can't quite get a read on the actual numbers because it's constantly changing.

 

I'll have to try disabling Intel EIST and Turbo Boost. Thanks for the info

 

I wouldn't do that. You are wasting energy by clocking at unnecessary frequency without a load. It's like going back to Pentium 4 days where you can literally heat your room by just idling.

 

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).


EIST enabled
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?