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post #5081 of 10702
Quote:
Originally Posted by Instynx;15506133 
I think I'm ready to join the club. Got a 4.7 GHz OC going. Not sure why mine is saying the Bus Speed is not at an even 100.0, for some reason it's reading at 99.77..

I see you've got an ASRock P67 Extreme4; I've got the same board, but not the Gen3. Try disabling Spread Spectrum; that's what I did, it fixed it right up.
    
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post #5082 of 10702
Quote:
Originally Posted by munaim1 View Post
Any reason as to why you're putting so much emphasis on idle votlage? Just to let you know that software monitoring is not 100% correct unless you use some form of a multimeter on your actual board like so then you won't know for sure:

Either way it shouldn't really matter, what matter's is the load voltage. Use offset mode and enable C1E and EIST and don't worry about it. I use High LLC with Offset because Ultra high causes my idle voltage to drop to low and I don't like it and also helps the voltage fluctuation.
Well, I'm curious on how Vdrop and VDroop works as "protection" to the system that's why I was asking. If I set VCore to the max "safe" voltage that I want to, I don't want the system to go over that value in any instance (whether at idle or at load).

Any reason why in my observations, Ultra High produced higher voltages than Extreme? Also in your system, why did Ultra High produced lower idle voltages than High when it is supposed to do vice versa?

If I use Offset, we eliminate the phenomenon of VDroop, right? Because the idle voltage will drop totally to a lower value.

Quote:
Originally Posted by apSlain View Post
Yes I have, including the things linked in that thread Once I got the BSOD, I made the following changes in the UEFI:

- C3/C6 to Disabled (due to Offset)
- Disabled Spread Spectrum (was getting a 99.8 BCLK reading from CPU-Z with it on, 100 CLK with it disabled)
- C1E and EIST to Enabled
- PLL and VTT are changed - unsure what I altered them to right now

The Prime95 tests are all being run when the system is not in use, on a fresh Windows install, on High Performance. Currently am working on tweaking the PLL/VTT values and running a 30min 1792K FTT torture test to get some initial stability results, then will try running a 12hr+ blend.

Just one question - you mention running the test with 80/90% of your available RAM. Do you mean just ensuring that 80/90% of your RAM is not in use when running the test, or should I be running a custom test inputting a custom value that is 80/90% of my RAM - which is 3276.8 to 3686.4? Sorry for the basic question, this is my first overclocking experience.
Quote:
Originally Posted by apSlain View Post
I see you've got an ASRock P67 Extreme4; I've got the same board, but not the Gen3. Try disabling Spread Spectrum; that's what I did, it fixed it right up.
I thought Spread Spectrum should be disabled ONLY when changing the BCLK frequency from the default 100MHz?
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post #5083 of 10702
This is interesting. After reducing LLC from Extreme to Very High on my 2500k, it won't stay stable at 1.31V @ 4.7GHz. The 4th core keeps giving me errors in Prime95 blend.

Raising it back to extreme put it back to normal.
post #5084 of 10702
Quote:
Originally Posted by sq_a380 View Post
This is interesting. After reducing LLC from Extreme to Very High on my 2500k, it won't stay stable at 1.31V @ 4.7GHz. The 4th core keeps giving me errors in Prime95 blend.

Raising it back to extreme put it back to normal.
This is expected because at Extreme LLC the VCore is higher to that of when using Ultra High LLC, or did you expect this already and adjusted your VCore in such a way that with both options you see 1.31 in CPUZ?
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post #5085 of 10702
Quote:
Originally Posted by Instynx View Post
I think I'm ready to join the club. Got a 4.7 GHz OC going. Not sure why mine is saying the Bus Speed is not at an even 100.0, for some reason it's reading at 99.77..

This happens on the Extreme4 with Spread Spectrum enabled, if you disabled it will go up to 100Mhz but BSOD on you at high overclocks so keep it enabled its all good.

edit: holy crap jacked ^
    
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post #5086 of 10702
Quote:
Originally Posted by kevindd992002 View Post
I thought Spread Spectrum should be disabled ONLY when changing the BCLK frequency from the default 100MHz?
I got the advice to disable Spread Spectrum from this forum and numerous others, whether to fix the 99.8BCLK issue or as general overclock advice; unfortunately, I'm not an expert on it.

In regards to LLC...what a divisive feature. I just got through reading this thread and it's enough to educate you while not giving a decisive answer. To sum up LLC (from my reading/understanding):
LLC On = lower idle voltages, greater voltage fluctuations (above the BIOS setting)
LLC Off = higher idle voltages, less substantial fluctuations (walled by BIOS setting)
I'm trying to figure out what to use to stabilise/finetune my 4.5GHz 24/7 OC. It's a tough one. The idea I'm leaning towards in my mind is that a 24/7, lower voltage overclock can benefit from LLC being on as the voltage spikes won't reach the danger zone...a higher overclock might be in danger with it on though.

Hmm.
    
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post #5087 of 10702
Quote:
Originally Posted by apSlain View Post
I got the advice to disable Spread Spectrum from this forum and numerous others, whether to fix the 99.8BCLK issue or as general overclock advice; unfortunately, I'm not an expert on it.

In regards to LLC...what a divisive feature. I just got through reading this thread and it's enough to educate you while not giving a decisive answer. To sum up LLC (from my reading/understanding):
LLC On = lower idle voltages, greater voltage fluctuations (above the BIOS setting)
LLC Off = higher idle voltages, less substantial fluctuations (walled by BIOS setting)
I'm trying to figure out what to use to stabilise/finetune my 4.5GHz 24/7 OC. It's a tough one. The idea I'm leaning towards in my mind is that a 24/7, lower voltage overclock can benefit from LLC being on as the voltage spikes won't reach the danger zone...a higher overclock might be in danger with it on though.

Hmm.
I'm not sure if this helps any but with my 4.8Ghz with my i7 I have LLC on and I get idle voltage of around 1.000v and under full load its 1.408v which is the sweet spot for my OC.

Is there really a negative to voltage fluctuations even if under full load it ramps up to what it needs to be?
post #5088 of 10702
Quote:
Originally Posted by kevindd992002 View Post
This is expected because at Extreme LLC the VCore is higher to that of when using Ultra High LLC, or did you expect this already and adjusted your VCore in such a way that with both options you see 1.31 in CPUZ?
I already knew roughly what LLC did, but wasn't sure of its effectiveness.

Anyway, would like to know if this is an indication that Extreme would be the best setting for any overclock?
post #5089 of 10702
Quote:
Originally Posted by crabby654 View Post
I'm not sure if this helps any but with my 4.8Ghz with my i7 I have LLC on and I get idle voltage of around 1.000v and under full load its 1.408v which is the sweet spot for my OC.

Is there really a negative to voltage fluctuations even if under full load it ramps up to what it needs to be?
That's about the same as the 4.8GHz O.C I just documented a few pages earlier. Not sure about what my idle voltage was though - should check that out.

In regards to the second query, I'm not too sure. I see why it may be worrisome that the voltage would spike to a level above what is specified in the BIOS, but whether it would actually cause an issue is beyond me. It seems to be a little bit of paranoia, but it never hurts to ask.

Although, if it's true that LLC [ON] is likely to cause an idle B.S.O.D, then I'll have to reconsider it.
    
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post #5090 of 10702
Quote:
Originally Posted by apSlain View Post
That's about the same as the 4.8GHz O.C I just documented a few pages earlier. Not sure about what my idle voltage was though - should check that out.

In regards to the second query, I'm not too sure. I see why it may be worrisome that the voltage would spike to a level above what is specified in the BIOS, but whether it would actually cause an issue is beyond me. It seems to be a little bit of paranoia, but it never hurts to ask.

Although, if it's true that LLC [ON] is likely to cause an idle B.S.O.D, then I'll have to reconsider it.
Oh I completely forgot I'm using offset mode as well with LLC ON with 0.040+. I can't recall any BSODs Ive gotten anytime recently tho. Honestly since I turned off C3 and C6 everything just "feels" much better for my setup, don't know why but its a weird snappier feeling with certain things.

For me personally I love the voltage fluctuation because it keeps everything nice and cool
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