Clock speed catching during stress test

Jamezz2 · Nov 10, 2015

Okay so I have an i5-4590 in an asrock extreme6 motherboard with win 7 ultimate and 8 gb of 1866 DDR3. I have the cpu set at the max clock speed, 3.7 ghz. It even says in the uefi that it's 3700 mhz. However, when I load up cpuz, the speed fluctuates between 3.5 and 3.7, which I understand when it's not under any load. However, when I use the stress test in cpuz, it stays at 3.5. When it's being stressed, shouldn't it max out at 3.7? I just want to know if the cpu is working the fastest it can and it doesn't seem like it is.

Supahos · Nov 10, 2015

Make sure turbo boost is enabled in bios, and set power management settings to performance... Should clear it up... If not try updating the bios.

GhislainG · Nov 10, 2015

Jamezz2 :

It can reach 3.7 when only one core is busy; it runs at 3.5 when all cores are used.

Jamezz2 · Nov 12, 2015

Supahos :

Turbo boost is enabled and it is set to high performance. The bios is updated. When I stress the cpu, even if in cpuz it happens to say it's at 3.7, it goes down to 3.5 and just stays there.

Jamezz2 · Nov 13, 2015

GhislainG :

I don't think it's that, as even when I use the single core stress test of cpu-z it still bottlenecks at 3.5. Could it have something to do with the voltage? In cpu-z it says the cpu voltage is only 0.992v

GhislainG · Nov 13, 2015

Use Intel XTU to monitor the frequency while you run a single (not 4) Prime95 torture test. The CPU will run at close to 3.7 GHz as does mine and other i5-4590 processors. Please note that I haven't changed anything in the BIOS of my ASRock H97 Performance motherboard.

In Intel XTU, you should configure hardware monitors and select "all system monitors" to see Core voltage, core temperatures, TDP, etc.

Jamezz2 · Nov 13, 2015

GhislainG :

Okay, so I downloaded XTU and it says that one active core is normally 3.7, however sometimes it dips to 3.6 and 3.5. When I ran prime95 with a single thread used, it still stays at 3.5-3.6, barely every hitting 3.7. In cpu-z, it says the core voltage is only 0.872, however in XTU it says it's 1.35. Which should I trust?

GhislainG · Nov 13, 2015

I tend to trust Intel XTU and AMD Overdrive more than other tools; I presume that both Intel and AMD engineers know more about their processors than anyone else.

Jamezz2 · Nov 13, 2015

GhislainG :

That's probably true. At this point, i'm done with messing around with this freaking thing. Thank you for your help!

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Clock speed catching during stress test

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