Why do all 4 Cores boost to 4.4 GHz when running Prime95

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cheapfrag2

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May 17, 2014
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4,510
I'm running Prime 95 Small FTT test. I set the BIOS to enable turbo boost. The max multiplier for Core 0 and 1 are 44, then core 2 is 43 and Core 3 is 42. My Windows 8.1 power plan is set to balanced.

When I run Prime95, all 4 cores are reading 4.3895 GHz. Why is that. I thought under load, the CPUs wouldn't boost that high and I thought the 3rd and 4th core were restricted to 43 and 42 respectively.

Can someone explain why all 4 Cores are boosted to the max when Prime 95 runs?
 
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C

cheapfrag2

Reputable
May 17, 2014
14
0
4,510
Sorry, one minor correction. The BIOS was set to enable Turbo Boost but the max multipliers were set to Auto (there were numbers beside each setting which I mistook for the setting under the Auto option.) When I manually set the Core 0 and Core 1 to 44, Core 2 to 43 and Core 3 to 42, now when I run Prime 95, all four cores are reading 4.19 GHz so they are all restricted to the lowest multiplier when all 4 cores are loaded. That now makes sense to me.

I'm still surprised that it boosts at all under 100% load though.

My CPU is a i7-4790K and my motherboard is a Gigabyte GA-Z97X-Gaming 7
 
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