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Hans Power

Questions regarding Vcore vs Vcore Offset on Haswell + Uncore Ratio

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Posted · Original PosterOP

I'm currently overclocking my Haswell I5 4690k on a Gigabyte GA-Z97MX-Gaming 5 and for good enough temps on stresstesting I settled on 4.3Ghz with a VCore Offset of +0.060v which adds up to 1.224v according to HWinfo64.

That seems to be stable and cool enough (at 88°C peak) with Realbench 2.56 which even uses AVX as far as I understand. But there's still some stuff I'd like to know to get the most out of my Hardware.

1) Is there a benefit of using a static Vcore instead of a Vcore Offset (specifically on Z97 + Haswell)? Also, with energy cost in mind (which is rather expensive in germany) - how much energy savings can I expect when the system is idling with a Vcore offset and all the other power saving features intact compared to static vcore and/or CPU clocks?

2) I'm currently experimenting with Uncore Ratio and I'm having trouble to get a stable system when I raise Uncore Ratio to 4.3 or 4.2 Ghz. 4.0 seems to be stable (for ~20 min so far) without any further adjustments.

First: Is it actually worth it performance wise for games and

second: What would I have to do to get a stable Uncore Ratio working at 4.3 or 4.2 Ghz? I tried raising the Vcore Offset to 0.080v but that raises the temps to up to 100°C (with AVX) on my not so beefy aircooler and didn't help with stability - at least not enough.


CPU: Intel Core I5 4690k | Mainboard: Gigabyte GA-Z97MX-Gaming 5 | RAM: 16GB DDR3 HyperX Savage 2133 | GPU: MSI RTX 2070 Armor | Case: Xigmatek Aquila |   PSU: Corsair RM650i | SSD: Crucial m500 120GB | HDDs: 2x Seagate Barracuda 4TB | CPU Cooler: Bequiet Dark Rock 3 | Casefans: Bitfenix Spectre LED red 200mm (Intake), 2x Bequiet Pure Wings 2 140mm (Exhaust) | OS: Windows 10 Pro 64 Bit

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