Can't overclock my haswell - help!

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h9dlb

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Aug 10, 2010
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Got a 4670k and a gigabyte sniper M5 mobo and aftermarket air cooler.

When I increase the cpu to 4.5ghz in bios and increase the cpu core voltage to 1.25 volts, when I boot into windows the cpu is at the stock 3.4ghz. I've tried everything such as a lower o/c, lower volts etc - what am I doing wrong ?
 
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bebop460

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It could definitely be that software isn't reporting the correct frequency, as ihog is suggesting.

Perhaps you ran into an issue similar to the one I had on my SB chip: I believe the CPU couldn't get enough juice to hit or sustain 4.5ghz, instead maxing out and stable at 3.5ghz, even though the bios was config.ed to 4.5.

I had to set the turbo to manual and 200. I think this is the current capability for the turbo. You may have a separate BIOS setting for the CPU's general (non-boost) current capability that needs to be tweaked.

If you post/link to your BIOS settings, we may be able to provide better help.
 
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socialassassin

socialassassin

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Are you checking the frequency when stress testing? That's when you should see the 4.5GHz. If its not under load, the CPU throttles down the frequency.
 
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bebop460

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I would suggest using Prime 95 to ensure the CPU load is 100%. You need to use it (or a similar program) to test for stability anyway.

Under "Advanced CPU Core Features" I'd try changing several things. I would think it would run at 4.5 ghz even with the turbo off, but I'm not at all certain. Also, having the power options set to auto could be an issue.

If you don't want to use the turbo, I would try bumping up the "Core Current Limit" a notch or two at a time and testing to see if it has any effect.

I don't see any reason not to use the turbo unless you want to try to have it configured to run at 4.5 ghz regardless or load percentage (if that is your goal, I'd disable Speed Step/EIST) .

To enable the turbo, set "Intel Turbo Boost Tech." to enabled and change the "Turbo Power Limit." I'd start at 125 and move up from there in increments of 25, or alternatively, set it at 250 and dial it back until you find the minimum.

On an unrelated note: 1.65 DRAM voltage; is that what your memory is rated? Its usually 1.5V these days.
 
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h9dlb

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Now this is weird - problem solved, but hope someone can tell me why. I'm using corsair xms3 1600 ram http://www.corsair.com/cmx4gx3m2a1600c9.html which runs at 1.65v. Obviously the new mobo defaults it at 1333mhz and 1.5v, so I manually clocked it to 1600 1.65v in bios.

I have now clocked it back down to 1333, 1.5v and now all 4 cores are showing and I can overclock the cpu beyond stock
 
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bebop460

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That's odd. All you did was downclock the ram to 1333mhz 1.5v?

Weren't all 4 cores showing before (you had them set to 45 in the turbo section)?

Often the CPU can't handle both the RAM and CPU overclock without tweaking other voltage settings (especially 4.5ghz+), but in that case I'd expect the RAM would be unstable, not that the CPU would refuse to run at the selected speed.

I would definitely verify memory settings in CPU-Z to ensure they are running per your motherboard config.

The only thing that makes sense to me is that by tinkering with the RAM settings, it altered/reverted other settings.
 
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