Heya EVGA fellows

First off, I'm very happy with my P67 FTW motherboard

Here are my current components

Core i7-2700K
Corsair AX850W Gold PsU
Corsair Vengeance DDR3 running at 2133 11-11-11-33 and 2x8GB
Corsair ForceGT 180GB SSD

Vdimm 1595 mV
Vcore 1330 mV
Vccio 1155 mV

Other voltages at stock settings, and bios settings disabled according to p67 overclock guide from this forum.

Running at 49x100.00 MHz

I'm working on making it 100% stable.
Tested the memory with the windows memtest app using 8 instances. Upped vccio until no more errors. (had to raise Vdimm from 1590 to 1595 to accommodate increased multi from 48 to 49) so memory is stable and looking good so far. Happy with that.
 
However, i'm not happy with the cpu part of the overclocking.
 
I usually increase the Vcore until i get no more blue screens when booting and then launching apps like FaH or LinX. Keep trying until I can run any of those for about 20-30 minutes withour blue screen.
 
Now, with a voltage of 1330mV I'm not getting any blue screens and linX can pass 5 cycles without erros and i can have FaH calculate for 12h without nothing to complain about... But Whenever I run Prime95 - i start getting an error with large FFTs.
 
What will I have to change? more Vcore ? (I'm afraid i end up with a too high Vcore as before when only using prime95 -> error -> increase vcore ... that strategy won#t work for me, since it won't tell me if it's a too low Vccio.)
 
I tried upping Vccsa or PLL a notch or two, but I can't seem to see any improvement.
 
Is 4.9GHz just too much for my cpu or am I just missing the right voltage adjustment (if so, WHICH voltage?)
 
Sincerely yours
Florian
 
 
EDIT: I dropped the voltage down to 1329mV (1328mV would cause LinX to produce error within the first run.)
So far, LinX passes (2-3 runs, I try to avoid running lots of runs with that), FaH folds for hours (tested 8+) without any issues and even Prime95 tortures with small FFTs for over an hour now without any issue. My next test will be the blend option in Prime95 as I have the feeling it might still be memory related (will try upping Vdimm to 1605mV and Vccio to 1165mV)

What are your bios settings?
 
I assume:
withOUT vdroop
c1e disabled
eist disabled
etc..
it sounds like the backwards ness of this bios needing to be set to without vdroop is causing the instability.
Also perhaps heat? what are ambient/core temps?

correct.
 
withOUT vdroop
internal pll voltage override enabled
EIST disabled
C1E disabled
CPU C3 disabled
CPU C6 disabled
 
core temperatures are low to mid 70's (celsius) and peaking around 78 for 1-2 cores with LinX. ambient - depending on the time between 18 and 28°C ;)
 
 

The i7 2700k tCase max is 72 degrees celsius as per intel specs anyway.
So if the cores are getting that hot, combined along with the sensor variance of 10deg or so it could just be too hot.
Lower voltage if possible perhaps? watercooling an option?
 
Personally thats what limited my 2700k on air so far is the temp, it will boot at 5.1ghz but the temp quickly goes above 72 and at my current settings I can fold and stay around 60-65 on all cores.

Honestly, I would say that temperature isn't an issue. When running Prime95 with large FFTs I usually won't even get to 70°C temperature. voltage regulators are 42°C, peaking at around 45°C so they are fine as well (water cooled board and cpu)
 
I found out that I'm somehow running into trouble with the memory. At all stock settings it's good, but when running at 2133 MHz 11-11-11-33 oder 12-12-12-36 i kept getting memory erros. The thing is. I had it running at that before with 4.7 GHz and it was perfectly stable (memory).. I even tested at 4.2GHz and the memory still ran into trouble. I'll probaby start from scratch again. I'm certain I can run a fully stable 4.8GHz with 2133MHz memory (2x8GB)... just a matter of tweaking.
 
Will I have to include Vccsa into my possibilities or am I better off leaving it at lowest (stock) voltage? PLL, Vccsa and PCH are all at stock. (but even tweaking them didn't help)

I really only get into vCore myself, Vccsa, PLL, and the others are above my pay grade so I leave them at default.
 
4.9Ghz is still awesome though! Nice rig either way.

PLL and VccSA remains in default as well for me. ccSA supposed to be left unchanged anyways, and for PLL I don't even know what it really does.

Vccio is needed for memory OC as far as I can tell and read.

BUT why does that happen:
First time OC at 48x100.00 I ended up with
Core 1280mV
Ccio 1140mV
Dimm 1590mV

And had HCI memtest run for over 100% without issues.

Now second trial from scratch
Core 1280mV
Dimm 1600mV
And values as high as 1065mV cause immediate errors on memtest, but lowering it raises the time needed for errors in memtest.

It's just a little frustrating not knowing which way to go -.-


Addition: second trial done at 48x100.26 to accommodate frequency loss ( now reporting 4801mhz instead of 4790mhz)

Quick note. If I leave the bclk at 100.00 my OS reports 99.77MHz for base clock. Any reason WHY?