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Skylake Overclocking Guide [With Statistics] - Page 249

post #2481 of 11361
Quote:
very prone to degrading?

Source?

And seemingly not, given the huge stock voltages that Intel is throwing out. There has been speculation about voltage being stepped down before actually reaching the delicate parts of the chip but i'm no engineer.
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post #2482 of 11361
Quote:
Originally Posted by Cyro999 View Post

On optimized defaults on my VIII Hero, my CPU uses 1.31vcore at 4ghz and 1.42vcore at the 4.2ghz turbo.

Same as mine! (different MB though) Though I still dont know for sure if the 1.42v at turbo is what the processor is really requesting itself, or if the motherboard bios is just set up to give that even though the processor doesnt really need it. Im not sure of a very good way to test that since we all know CPUs can undervolt by varying degrees so manually setting a lower voltage isnt really a good way to properly test whether 1.42v is what the CPU is requesting.
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post #2483 of 11361
For reference these are my optimised values (4.2giggles) under different load conditions.

Under load Cine15
vcore = 1.28
VID = 1.24

Under load Prime 28.7 small FFT
vcore = 1.328
VID = 1.266

Under load Prime 28.7 Blend
vcore = 1.36 - 1.376
VID = 1.32 - 1.345

Anyway, how many people here are running with iGPU only at the moment, it's doing my head in. If I let XMP dictate VCCIO / SA then the screen will flicker, to fix that I lower them to 1.05v and my RAM still behaves nicely. But it also has another problem, simple logon or using OpenGL test will throttle it. Manually forcing 1000Mhz in BIOS (auto = 1150Mhz) will remove this problem as it's now lower than the throttled speed, but I'm unable to find a setting that fixes that. Current / Phases / etc settings do nothing.
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post #2484 of 11361
Perhaps you need to manually set power limits when using an iGPU?
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post #2485 of 11361
Quote:
Originally Posted by Serandur View Post

Skylake on a Gigabyte board's been a pain in the rear for me to overclock in a way that drops idle voltage. There is no adaptive mode and C-states don't do jack on manual voltage mode, so I tried offset. Any negative offset from the BIOS, no matter how small, causes my system to fail to boot. So now I'm doing offset (-0.05v) purely through XTU in conjunction with 45x multipliers and XMP (3000 MHz) with LLC on standard through the BIOS. Voltage drops at idle like I want and it seems perfectly stable, but Skylake's load voltage still varies wildly depending on what I'm doing. It's ~1.25v for Realbench, ~1.3 for games, and up to 1.35v for Prime95.


I don't suppose there's much more I could do in terms of specific voltage control? I suppose I'm an extreme minority, but I never want my overclocked chip using more voltage for anything than it needs to (for longevity as well as erring on the side of caution with a new architecture/process node). My chip doesn't need more than 1.3v in manual mode to be stable in everything at 4.5 GHz, but I really don't want 1.3v surging through my chip 24/7 if it can be avoided. Otherwise, I guess this is my conservative 24/7 overclock. 4.6 and 4.7 are easily doable, but occasional Prime95-type voltage spikes worry me.

This is a problem for me as well. I performed some testing using offset Vcore which currently sits at +60mv LLC2 for 48x. This results in ~1015mv idle and ~1410mv max gaming/encoding. This is better than 1380mv idle using manual. Unfortunately, using this setting, XTU bench will rocket Vcore to ~1460mv. Vcore was read with DMM. So basically, separate bios profiles are required for max oc and low idle volts. Gaming/daily = +60mv offset. Benching=1410mv manual.


Quote:
Originally Posted by error-id10t View Post

For reference these are my optimised values (4.2giggles) under different load conditions.

Under load Cine15
vcore = 1.28
VID = 1.24

Under load Prime 28.7 small FFT
vcore = 1.328
VID = 1.266

Under load Prime 28.7 Blend
vcore = 1.36 - 1.376
VID = 1.32 - 1.345

Anyway, how many people here are running with iGPU only at the moment, it's doing my head in. If I let XMP dictate VCCIO / SA then the screen will flicker, to fix that I lower them to 1.05v and my RAM still behaves nicely. But it also has another problem, simple logon or using OpenGL test will throttle it. Manually forcing 1000Mhz in BIOS (auto = 1150Mhz) will remove this problem as it's now lower than the throttled speed, but I'm unable to find a setting that fixes that. Current / Phases / etc settings do nothing.

Default values for my chip using latest bios. This bios defaults to 42x101. Max VID 1.420. Max vcore read on DMM = 1.275v. Warning: Spoiler! (Click to show)
 
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post #2486 of 11361
Quote:
Originally Posted by Serandur View Post

Skylake on a Gigabyte board's been a pain in the rear for me to overclock in a way that drops idle voltage. There is no adaptive mode and C-states don't do jack on manual voltage mode, so I tried offset. Any negative offset from the BIOS, no matter how small, causes my system to fail to boot. So now I'm doing offset (-0.05v) purely through XTU in conjunction with 45x multipliers and XMP (3000 MHz) with LLC on standard through the BIOS. Voltage drops at idle like I want and it seems perfectly stable, but Skylake's load voltage still varies wildly depending on what I'm doing. It's ~1.25v for Realbench, ~1.3 for games, and up to 1.35v for Prime95.


I don't suppose there's much more I could do in terms of specific voltage control? I suppose I'm an extreme minority, but I never want my overclocked chip using more voltage for anything than it needs to (for longevity as well as erring on the side of caution with a new architecture/process node). My chip doesn't need more than 1.3v in manual mode to be stable in everything at 4.5 GHz, but I really don't want 1.3v surging through my chip 24/7 if it can be avoided. Otherwise, I guess this is my conservative 24/7 overclock. 4.6 and 4.7 are easily doable, but occasional Prime95-type voltage spikes worry me.

With my Gaming 5, I have yet to see vcore readings drop as well with manual voltage and c-states(C3)/eist enabled, however I do get core VID drops. With minimum processor state at 5%, the frequency will hit lowest 800Mhz and VID will hit 0.760v lowest, though it bounces around? Is this related in anyway?

Also have you managed to change you FCLK? The gaming 5/F3 bios isn't giving me an option. Really stupid that I have to take a gpu performance hit cause Gigabyte is to lazy to update.
post #2487 of 11361
So I'm starting an experiment with my chip. I have left the vcore on auton for my 4.5ghz OC and with a prime load it is fluctuating from 1.32-1.416 . Im going to let this run overnight and see if I still get a rounding error. I wonder if the mb can tell what exact voltage is needed to keep the chip from being starved. I will keep you posted.


On second thought my chip just hit 97c with vcore on auto ( never hit that high before ), im going to try maybe really low volts lol.


I think I just have a high leakage chip.
post #2488 of 11361
Couple quick tests with my new 6700k, some results for the statistics thumb.gif

first off 4.5 1.200V Warning: Spoiler! (Click to show)

4.7 1.328V Warning: Spoiler! (Click to show)
post #2489 of 11361
What version of prime is everybody using? I haven't been able to pass 28.7 over 12 hours on 4.5 blend standard preset. Has anybody actually passed a blend 12 hour test? I'm trying to figure out if avx is just bugged with this chip or if anybody else can actually pass prime95 28.7 12 hours. Some people can't pass it stock, which if that is the case I need a better test than x264. I can pass x264 at 6 hours at 4.7 no problem but prime95 breaks it. OcCT seems like it hasn't been updated in awhile and linpack will hit 80c near stock with a 360 and 240 rad set up. Maybe I need to delid?
post #2490 of 11361
Sorry ignore this post.
Edited by CC268 - 10/5/15 at 7:43pm
    
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