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post #744 of (permalink) Old 01-01-2018, 04:10 PM
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Originally Posted by renhanxue View Post

There's a difference between turbo and turbo. Your CPU can be clocked at 4.8GHz without actually doing much and without consuming much power at all (try setting the power management in Windows to "high performance" and I think it'll stay clocked at max turbo all the time). Using the turbo voltage will raise that "idle but clocked up" voltage, but you don't really need that. When the CPU actually starts doing stuff and actually consumes more current, then the voltage will droop and counteracting that is the point of LLC. You don't need to counteract it completely, in fact you probably don't want that at all, but it's still helpful in your situation. What LLC won't do though is increase voltages when the CPU isn't heavily loaded.

Now, granted, what LLC is really for is when you need a pretty high voltage for heavy loads but you don't want to set your idle-but-clocked-up voltage to something dangerously high in order to get your load voltage after vdroop high enough, but I still think it's a pretty handy tool to use in your case. Raising the turbo voltage would also work though. The SVID behavior seems like a crude tool to me, though.

I've only tried manual so far to get a baseline for this CPU at 4.7GHz with no AVX offset. Setting 1.3v with LLC 4 leads to a reported vcore of 1.232v when running OCCT's small dataset test. HWinfo says the CPU package draw is just shy of 150W and a glance at the watt meter in the wall socket seems to indicate that's in the right ballpark. Seems quite stable so I think I'll take a look at 4.8GHz tomorrow.
Good point on turbo voltage, didn't think of that! So, disregarding turbo voltage (keep under SVID) and trying to stabilize with LLC seems to be the better choice, though it's probably best to keep it 5 or lower(?).

SVID behaviour setting is indeed crude, and strange. If you leave it on auto (default) it resorts to worst-case, meaning a probably unnecessary high SVID. Pair that with LLC and you'll have some hefty volts at load...

Tomorrow I'll finally get to delidding, will get to pushing that 5GHz soon!

ASUS Z370-E | [email protected] | Corsair 32GB 3.2GHz | Sapphire RX Vega 64 Nitro+
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