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[Official] The Sandy Stable Club **Guides, Voltages, Temps & BIOS Templates** Inc SPREADSHEET - Page 634

post #6331 of 10697
Quote:
Originally Posted by turrican9 View Post




I don't know if there have actually been any documented cases of Sandybridge CPU's failing at high Vcore (1.45v - 1.55v) over time?

Yet...!
Quote:
Originally Posted by Tom Thumb View Post

You need to take the CPU/PLL voltage off of auto. It's to high on auto. Change it to 1.5v and try that, and work your way up if it fails. thumb.gif

If I recall correctly, too low a PLL and it wont boot to windows, right? So just inch up until it gets to desktop? Or do I need to run p95 to verify the PLL as well?
Edited by FPSDavid - 12/28/11 at 8:16pm
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post #6332 of 10697
Quote:
Originally Posted by FPSDavid View Post

Yet...!
If I recall correctly, too low a PLL and it wont boot to windows, right? So just inch up until it gets to desktop? Or do I need to run p95 to verify the PLL as well?

You should not have a problem booting into Windows at a PLL of 1.5v and the CPU voltage your currently running. But you will have to run P95 to see if your stable. If not stable, turn it up a notch or two (PLL voltage) and test again! You gotta have patience doing this stuff! thumb.gif
 
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post #6333 of 10697
Are you currently trying to get 4.7 or 4.8 stable?
 
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post #6334 of 10697
Quote:
Originally Posted by Tom Thumb View Post

You need to take the CPU/PLL voltage off of auto. It's to high on auto. Change it to 1.5v and try that, and work your way up if it fails. thumb.gif
Quote:
Originally Posted by Tom Thumb View Post

Are you currently trying to get 4.7 or 4.8 stable?

4.8

Should I just be doing standard prime blend? It failed and BSOD'd after 8-9 hours last time frown.gif
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post #6335 of 10697
Quote:
Originally Posted by FPSDavid View Post

4.8
Should I just be doing standard prime blend? It failed and BSOD'd after 8-9 hours last time frown.gif

Standard blend is fine. Some believe you should test with 80%-90% of your available ram as well. I believe I used 70%. The choice is yours.
Edited by Tom Thumb - 12/28/11 at 8:53pm
 
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post #6336 of 10697
Actually it was 65% of my total ram.
http://cdn.overclock.net/e/ed/ed5588c6_4.8ghz.jpeg
 
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post #6337 of 10697
Quote:
Originally Posted by Tom Thumb View Post

Standard blend is fine. Some believe you should test with 80%-90% of your available ram as well. I believe I used 70%. The choice is yours.

Before I forget, PLL Overvoltage, Enabled or Disabled? It's currently Enabled, just lowered PLL to 1.5v.
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post #6338 of 10697
According to munaim1,
CPU PLL Overvoltage is only needed when a particular multi (usually the high ones (46x+)) doesn't boot into windows.
Not sure what mine is at. On my laptop right now!
 
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post #6339 of 10697
Thread Starter 
Here's my quick little sandy guide:
Quote:
The only things will that will require multiple changes are the vccio (VTT), PLL voltage and vcore, refer to this:

Set the whole thing to stock and start again. This time only change the RAM to XMP (STOCK) and run prime blend for a few mintues to see that your CPU is functioning properly.

Then comes the task of determining the voltage for the multiplier, but that comes after you find the correct LLC setting for your motherboard. LLC = Load line calibration, it's there to help you eliminate or reduce the vdroop as much as possible. Vdroop is the voltage difference between what you set in the BIOS / UEFI and what you really get under load. You will have to work out which works best for YOU. For example, if you set 1.35v in the BIOS and under load during stress testing it's 1.31v and that's HIGH or Level 2 LLC, then you may have to increase the LLC setting to reduce that droop, now depending on how your mobo works it could be like so:

Level 1 being the highest LLC setting and 5 being the lowest and vice versa. The objective is to keep the voltage under load as controllable as possible without it letting it spike. These LLC settings will be different amongst mobo's. For Asus mobo's the Ultra high (75%) LLC seems to work best for when using Manual voltage, however I personally have found using high LLC with offset is a little better, idle voltage is a little higher (can be helpful in preventing those pesky idle bugs) and voltgea fluctuates a little less when under load.


Then it comes to that task of finding the actual voltage for the overclock. Set the vcore manually to 1.25v, Leave C1E and Speedsteep enabled and run C3 and C6 on Auto if you can, if not leave them enabled. Also leave Spread spectrum enabled, if you find that it disrupts the BCLK in CPU-Z then just disable it.

Additional settings that you need to change from the get go, but won't need to be changed afterwards:


Can be found under advanced settings/cpu configuration:
Quote:
For Asus Mobo's
CPU Current Capability - 140%
Phase and Duty Control - Extreme
EPU Power saving - Disabled
VRM Frequency - Manual - 350
Quote:
For Asrock Mobo's
Turbo Boost Power - Manual
Short Duration Power Limit - 250
Long Duration Power Limit - 250
Core current Limit - 250
Quote:
For Biostar Mobo's
CPU Core Current max (AMP) - 150
Power Limit Value 1 & 2 - 200
Quote:
For Zotac Mobo's
Turbo Boost Power Max - 250
Turbo Boost Short Power Max - 250
IA Core current (AMP) - 200
Quote:
For Gigabyte Mobo's
Turbo Power Limit - 200
Quote:
For MSI Mobo's
Short Duration Power Limit- 250
Long Duration Power Limit - 250

CPU PLL Overvoltage is only needed when a particular multi (usually the high ones (46x+)) doesn't boot into windows.

This should be a stepping stone to get your rig stable. With those settings you will eventually get to the point where you're stable or nearing stability.

Set the multi to 45 and the vcore to 1.25v and increase the vcore each time after you stress test, run a quick custom prime with these FFTs (1344 & 1792) like THIS and go back and change the vcore accordingly, bump it by one not big jumps and that goes for PLL and VCCIO (VTT) and VCORE!!!

Work your way up from there, increase multiplier and test with prime blend, if it fails, increase the voltage or continue increasing the multiplier until you are satisfied with the temps.

Just a note: The custom FFT's are not that consistant, making them not all that reliable, however if it works for you, then that's great. What I mean by inconsistant, is that it may pass once with the same settings but may fail the exact same run second time round. In that instance I will recommend you to run a standard blend test to find your overclock, using intervals of 15/30mins. This duration will increase when you're nearing stability. This is a lenthy process, one that takes time and patience, make sure your up to the task thumb.gif


When nearing stability ie. lasting a couple hours or little more in prime blend and it fails, you could try a couple of things like tweaking the PLL and VCCIO (QPI/VTT).

When RAM is at stock (for example, around 1.5v and 1600mhz) increasing the the VCCIO can help general stability when overclocking the cpu, usually between stock and 1.125v. If you're overclocking RAM then increasing it further might help.

PLL voltage between 1.5v - 1.7v could also help.

Just a small reminder, don't think more voltage = more stability doh.gifWhen changing any values in the BIOS / UEFI, start low or stock and work your way up in small increments.
Quote:
Originally Posted by munaim1 
Just thought I'd let you guys know, I have been testing the PLL voltage further and found something quite amazing. With my current stable settings including the PLL voltage around 1.7v was stable as you can see from my submission to the club. For the last 10days or so I tried messing around with the PLL, I dropped it down to 1.4v and started going up, I kept on receiving the Error 124 up until I reached 1.55v and it passed both the 1344 and 1792 test along with a few hours of prime blend. My sweet spot is at 1.55v.



Here are the additionl info regarding PLL voltage, VCCIO and VCCSA: READ BSOD 124 / IDLE Freezing on Sandy? & THIS (scroll down a little to the *~*IMPORTANT TIPS & FINDINGS*~* section

Head over to the Sandy Stable Club for more info and tips thumb.gif


One more thing, BSOD Error code 101 is usually refered to the vcore being too low, Error 124 can also be vcore, VTT (VCCIO) or even PLL voltage being to high or too low.

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post #6340 of 10697
Quote:
Originally Posted by shad0wfax View Post

EDIT: I hid your screenshots in a spoiler to save space.

The voltages and temperatures look good for your clocks. Your bus speed looks a bit odd; usually they're 100.0 and not dipping into the 98 range.

Also, I'm fairly certain that munaim1 wants to see 3 instances of CPU-Z open at once, one for cpu, one for motherboard, and one for memory. Version 1.59 of CPU-Z is available if you want it, but your version meets the requirements.

Be sure to add a notepad or stickynote with your OCN username and type of cooler into the mix as well.

Lastly, you might try bumping your memory use up to 90% or higher from that 87% if you're going for the >= 90% super-stable entry.


They're all just minor things though, as your OC looks great.

Thanks for the tips.

Well I'm back with a 12 hour test.

338

All that took to get over 4.8GHz was a .1MHz base core increase. Strangely anything above that and I'd need to up the voltage.

I still haven't figured out that VID being at 1.4261 yet. I'll keep digging into the MSI bios. Half blessing, half basket case that thing is.
Edited by sovereign73811 - 12/28/11 at 9:39pm
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