CPU utilization not reaching 100% - Core2Quad Q9650

poonmk

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Apr 24, 2016
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Hello!

I have a stock HP computer that has a Pegatron IPIEL-LA3 (Eureka3) motherboard (http://support.hp.com/us-en/document/c01746799). I recently swapped out the Q8300 CPU that came with it for a Q9650. I made sure that the BIOS is the latest version and has the right microcode (it did and updated it anyway). No overclocking or anything like that (not that the MB would allow it anyway). The hardware runs fine except CPU utilization would exceed 93% utilization at 2.76 GHz (e.g., running Prime95) according to Task Manager in Windows 10, which also ignores fixing the min/max processor state (and throttles the CPU dynamically).

However, CPU-Z (and even Windows itself) reports the max CPU speed (3.00 GHz)and other specs correctly. CPUID HWMonitor also reports 3 GHz and 100% utilization in Prime95. The core temps do eventually exceed 70°C (as in the screenshot) but this occurs right away even at lower temperatures.

Clipboard01.jpg


So, which is correct? Searching for similar reports online has not been fruitful, and I am scratching my head!

I thank you in advance for any insight into the discrepancy and also how I could get Windows 10 to follow the power plan settings.

Gregory
 
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lindsay24

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Mar 30, 2015
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poonmk

Commendable
Apr 24, 2016
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1,510


Thank you for your response. I tested a few things out and found that Windows also treated a Q8300 (on a different brand motherboard) the same way (i.e., 92% utilization and speed), stuck in dynamic throttling. However, no such issue with a Duo E6600, so this may be a specific issue between Windows and the Core2Quad's.

I am running the stock fan, so I can obviously do much better in terms of cooling. Do you think it could be triggering any of this?

Gregory
 

lindsay24

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Mar 30, 2015
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It shouldn't be. Intel ships stock coolers with CPUs because their engineers have deemed them adequate to cool that CPU. Those temps do look a bit warm though. A bad mount maybe? Try installing Intel XTU, it shows if a chip is thermal throttling.
 
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