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Old November 6, 2011, 11:17 AM
keto keto is offline
Join Date: Jul 2009
Location: Edmonton
Posts: 265

Yup. The chip sends a signal to the system, based on many factors but including the cpu multi, called VID or SVID. It's a voltage reading that's sort of a 'suggestion'. With offset, you don't set vcore manually, the system sets it based at least partly on the VID. The system calculated vcore can be too low, too high, or just right for your cpu. You use offset (and LLC level) to compensate for this system calculated vcore.

So, let's say you established that, setting vcore manually, you need 1.360v @ 4.5. You go into your bios, set it to 'offset mode' and, when you boot into Windows and apply a load, you see that it's only giving you 1.345. You'd then go back into bios, set offset to '+' and add .015v in the box, reboot, and you should see 1.360 at load. See below, if you change the LLC level, your offset calculation is going to change.

There is a potential problem to this - for some systems, when the idle voltage drops it's too low and can cause random BSODs. The workaround is to lower your LLC level, the lower the LLC level the higher vcore will be at idle. But lowering LLC also changes your load vcore, so you'll have to do that calculation after you change LLC and boot up, then go back and change your offset + or - (likely add more +).
2600K @4.6 for now, still tweaking.
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