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post #61 of 93
You would think so but not the case with my setup for some reason. 100% LLC and the bottom drops out. The 25% I have it on now allows for a minor voltage spike under load and disabled it spikes really high in blend test.
    
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post #62 of 93
Quote:
Originally Posted by Blameless View Post

I recommend against using high LLC settings.
Not once on any platform, nor any system, have I ever found high levels of LLC to be helpful. Without fail, I have been able to achieve stability with lesser maximum load voltages if LLC was disabled, or set to a low or low-moderate value. I generally use an LLC of 2-4 out of 10 steps on my Gigabyte 1155 boards, and leave it totally disabled on my 1366 systems.
Idle voltages are virtually meaningless. So little current is drawn at idle that even significantly higher idle voltages (a tenth of a volt, or even more) won't mean much for power consumption or chip longevity.

I found the same thing for idle power (only a 2 watt difference for 0.35 V-idle difference). But I'm confused about the load situation. I had thought that at load, the CPU wouldn't know the difference between:
1. max LLC and a slightly lower Vcpu setting in bios
2. zero LLC and a slightly higher Vcpu setting in bios
so long as they both produce the same Vcore applied to the CPU under load. Or is something else going on?
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post #63 of 93
Thread Starter 
Ok, can someone explain this to me? So this morning, I loaded optimized defaults in the BIOS to test the stock chip and make sure it's stable by itself. Well I didn't even look at CPU-Z and just walked away after starting the Prime95 blend test. I texted my roommate to make sure it's still running and he said it's stable at 3.7. Wait, isn't this chip supposed to come clocked at 3.9 by default???
post #64 of 93
There is more going on that you can observe without a decent oscilloscope.

If the CPU was indeed being fed exactly the same voltage between the two settings their wouldn't be a difference, but that isn't how VRMs work, especially under fluctuating current demands. LLC seems to exacerbate ripple and voltage spikes.
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post #65 of 93
Interesting -- thanks! I will run some trials with a lower LLC now.
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post #66 of 93
Thread Starter 
Never mind. Found the answer here: http://www.legitreviews.com/article/1914/2/ "The Intel Core i7-3770K usually runs around 3.7GHz when under full load. The Intel Core i7-3770K can hit 3.9GHz when running a single threaded application, which is the highest it can go without overclocking it."
post #67 of 93
Quote:
Originally Posted by Nihilo View Post

Ok, can someone explain this to me? So this morning, I loaded optimized defaults in the BIOS to test the stock chip and make sure it's stable by itself. Well I didn't even look at CPU-Z and just walked away after starting the Prime95 blend test. I texted my roommate to make sure it's still running and he said it's stable at 3.7. Wait, isn't this chip supposed to come clocked at 3.9 by default???

It should turbo up to 3.9 when 1 core is active. 3.7 is the same turbo I got for all cores active. 3.5 is the actual default clock.
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post #68 of 93
Thread Starter 
Ok so I'm starting with 4.2 and going to do a manual VCore. Oddly enough i left it at poesy manual and our wouldn't bout with the standard setting of 1600 on my RAM,it put it at auto...why?
post #69 of 93
Quote:
Originally Posted by Blameless View Post

There is more going on that you can observe without a decent oscilloscope.
If the CPU was indeed being fed exactly the same voltage between the two settings their wouldn't be a difference, but that isn't how VRMs work, especially under fluctuating current demands. LLC seems to exacerbate ripple and voltage spikes.

You've seen it on an oscilloscope? That doesn't really make sense to me.
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post #70 of 93
I did testing with couple 1366 cpus, and whatever vcore at load I needed to be stable, it was exactly same with LLC on or LLC off. If I needed 1.34v for 4.4, I could get their using 1.44 bios with LLC off, or 1.38 bios with LLC on, both were stable, and lowering vcore on either was unstable.

And for 4.7ghz on Ivy, I have run prime with both LLC on turbo and on high, and both ways need same 1.308 vcore at load cpuz.

Swiftech has done some testing with oscilloscope and multimeter, and felt most stable were LLC settings that maintained similar idle/load vcore, that was done a while back.
http://www.xtremesystems.org/forums/showthread.php?272963-Gigabyte-Z68X-UD4-B3-Voltage-Review&p=4898004&viewfull=1#post4898004

But overshoots are governed by vrm circuitry and load vcore...and I will continue to use LLC to try to maintain minimal vdrop/vdroop...and never have seen any LLC related stability issues on any cpu I have OCed yet, and I have never been able to lower the required load vcore by turning LLC off or on for that matter.
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