X79 Overclocking Guide

hi 8pack I followed your x79 guide for oc of my memory and all is well passed memtest 3 hours long memory is corsair vengeance red 1866mhz @ 1.5v ive got them at 2000mhz @ 1.605v timings are 9-11-10-28 only one notch up on 3 of the timings.my mobo is rampage 4 extreme and ive got 32gb of this memory over 8 slots,now heres my problem when I shut down my system and turn it on again my system keeps shutting off and on in a loop and sometimes im forced to reset bios to get it to boot,i know my oc on ram is stable just don't whats causing this problem hope you can help oh im on 125 strap cpu @4.5ghz 3930k h100 cooler cheers. crasher,continuation of this thread,ive now clocked memory at 2133mhz on the 100 strap and my system seems to like this setting better than 2000mhz on 125 strap strange things happen lol anyone care to help with my problems with 2000mhz on 125 strap as this is confusing me loads cheers crasher
 
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Week or so on and now at


4960@ 4.5 /100 BCLK
2133 CL8-10-10-28-CR1-96 @ 1.65v (TG Xtreme 2600C10)
VTT 1.1v
VCCSA 1.075v
Vcore offset 0.005v (1.248v)
PLL 1.5v

7 hours stable in Memtest. Going to try and lower VTT some more next.
 
The issue is a cold boot one clearly. Have you tried tuning VCCSA and VTT voltages. These are the ones for the IMC on the cpu and often help at cold boot.

Also if your using any settings at auto the MB will tune these for you. They may well be set slacker at 2133 than 2000 meaning cold boot disappears. With them set slacker performance usually suffers.
 
What you reckon for this 8-Pack for 24/7. This is final now

4960x @ 4.5 Vcore offset 0.005v (1.216v) (all C states enabled)

CPU Vcore LLC - Regular

Manual: VCCSA - 1.085v

Manual: VTT - 1.085v

16GB 4x4GB 2133 CL8-10-10-28-CR1-96 @ 1.65v
 
hi 8 pack thanks for the help,how much vtt/vccsa should I try im @1.1 for for vccsa and for vtt im @1.15,not tried any tweaking of it yet but I would like to,at moment im at 11-11-11-27 timings @2133mhz (which is the same memory timings as the 2133mhz version modules that I have)mine are 1866mhz @9-10-9-27.for 2000mhz when it did eventually post and memtest stable I used 9-11-10-28 @1.6v(same voltage used for 2133mhz oc)I just added .05v more for added stability.i would like to know how much ideal vtt/vccsa voltage I should use for the 2000mhz oc tweaking cheers hope I make sence mate>Crash
 
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MjFrosty said:
1.1 is the sweet spot mostly for 2133. Try to keep VTT and VCCSA within .3v of a volt of each other for stability
Click to expand...

Vcore, VTT and IMC(VCCSA)/SA seem to have a bit of an odd three way relationship - if they get too close in certain combinations or too far apart it can cause instability.

IIRC Intel guidelines is to keep VTT and IMC between 0.01 and 0.1 of each other for best results and neither more than 0.3v different to the VCore (and in no case are any supposed to be more than 0.3v apart from any other).
 
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MjFrosty said:
What you reckon for this 8-Pack for 24/7. This is final now

4960x @ 4.5 Vcore offset 0.005v (1.216v) (all C states enabled)

CPU Vcore LLC - Regular

Manual: VCCSA - 1.085v

Manual: VTT - 1.085v

16GB 4x4GB 2133 CL8-10-10-28-CR1-96 @ 1.65v
Click to expand...

Just got my new 4960x - it's sweet compared to my last one lol!
What you using for stability testing dude? - I was using IBT Max (got as low as +0.005 / No LLC using that) but the ultimate stability test seems to be prime 95:

IBT is kinda worthless for a 6 core processor. Test stability quickly with cinebench R15 (free). then move to p95: custom,, 5 min per FFT and 12288 ram if you have 16GB. Use the shorter fft time to stress more of the architecture faster.
Click to expand...

I'm now having to work my way back up on the offset lol!
 
Stability just use your PC for your applications. Dont mess about for ages dialing down core volts again and again and again. Have fun using your PC unless of course the volts are like 1.4v +

VTT and VCCSA you can go to around 1.2 on both no probs.
 
I'm ****ing around with different ram at the moment so I just set VTT and VCCSA to 1.1v as for 2133 it's plenty. I spent a day or two trying to get them low as I could but as Ian says it's pointless unless you're having to put a lot of juice through it.

I'm at 0.0030+ / medium LLC / phase optimized / current capability 120% (1.26v) for 4.5. If you're almost stable at 0.005 offset you've got a good chip.


Now try 4.9 with 1.4v please on 125 strap :D
 
Offset mode is starting to miff me off. Just can't get it to stay 100% stable. Namely at desktop and moments after loading the OS.

What does 124 BSOD relate to on Ivy-E? Could it be memory related?

Edit: Think I'm going to leave offset and just run 1.26v manual vcore. Not worth the agro.
 
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124 is not enough vcore I believe bud.
I can get IBT Max stable on 0.005+No LLC, but to get it prime95 (that test I mentioned above) stable I'm now up to 0.010+Medium LLC - Thats fully stable. - I've also ran Titanfall for 2 hours at this setting before so pretty sure that's my best stable for 4.5.

hang on a sec - is that you on that tuther forum? ;)

I tried giving it some max clocks tests last nite - didnt perform as well as i thought it would:
4.7 works at 1.4v with pll overvoltage enabled (could probably be tuned down volts wise but didnt get chance to test) - I ran cinebench before with these settings when I first got the chip.
Tried 4.8 at 1.4v and it booted, but cinebench crashed.

using 125 multi i tried 125x45 mistakenly and it booted but didn't get as far as login prompt before crash- lol - woot ain't that like 5.6Ghz!
x40 (5ghz) again booted but didnt get as far as login
x39 (4.875) once again booted but didnt get as far as login
x38 (4.75) again didn't get as far as login.

I didnt want to push further than 1.4v (high llc) and was using AUTO on everything else other than having PPL overvoltage enabled - could probably get more.
Click to expand...
 
^ That's not me, but I'm Silent_Scone over there yes :)


I had lowered vcore to 0.030 offset from 40 so it's possibly just a tad not enough for light load. If I get any more grief I'll just switch back to manual, for under 1.3v it's hardly worth the trouble as I'm having to use slightly more than I would normally in manual just to get the same clocks stable. Shouldn't really have to set LLC for CPU any higher than medium.
 
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that quote was mine from 'that forum' lol ;)
Yes silent scone was what I was implying :) :)

Agree - don't use anything higher than medium LLC (its not recommended by asus either!)

Theres a good guide written by Raja on the ROG forums for Offset vcore - I lost the darn link sorry.
 
Ta, I've had totally stable clocks up to 4.8 on this chip for sometime but I'm just messing about purely because I'm bored now! Never tampered with offset so was wanting to gain a better understanding of how it worked out with VID but it's proved slightly temperamental
 
just offset bud combined with relevant LLC setting.

remember offset goes according to the VID rating on the CPU - so it will be different per cpu. saying that I was so suprised I managed +0.010 + Medium LLC on my new 4960 I had to try it again today - completed prime+75% mem loading (as mentioned above) for the past 3 hours no probs. Really happy with that!
 
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