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~~~~~IMPORTANT SANDYBRIDGE OC INFO: Voltages & OC Guide!!~~~~~

yep 1600mhz - didn't expect it to run at that speed with 1.5v but since Gibbo posted about it so I thought I'd give it a shot.
 
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I've just been testing out the new bios along with auto settings. 4.5ghz booted into windows with auto voltage which appeared as 1.32 but it bombed out in prime blend within a few minutes!
 
Stop It Rawr said:
Then it looks like undervoltage at 4.6ghz was your issue then.

Out of interest, what does CPU-Z report your voltage as being currently? On my i5 2500k while 4.6Ghz requires 1.38v+, 4.4Ghz only needs 1.3v, considerably reducing power draw and giving temps a good drop too.

Of course if you're stable do not worry too much, but if you're feeling brave it may be worth reducing VCore by a notch or two. If it BSOD's simply up the voltage back up a notch.
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CPU-Z reads the voltage at 1.336v.

Thanks for the advice. I may have a little play once i'm happy with the current settings.
 
Max3 said:
I've just been testing out the new bios along with auto settings. 4.5ghz booted into windows with auto voltage which appeared as 1.32 but it bombed out in prime blend within a few minutes!
Click to expand...

Hi max3

Don't use prime, Use intel burn test v2.4.

Go into bios set your overclock.

Open up intel burn test.

Set stress level to high

Set Time to run to 5

Threads to 4 as you have a 2500k.


Intel burn test will work the cpu a lot faster and usually provides more heat and a better work than prime.

If you pass the 5 runs you know you have something to work on and you can then do more runs.
 
I use a combo of linx (IBT interface is kinda ugly) and prime blend at the moment for testing. I've seen linx passes and prime blend fails and also vice versa so I'm not happy until they both pass.

I don't think the auto settings will give me anything stable from my brief test but I'm not fussed at 4.4ghz with manual settings is good enough.
 
Max3 said:
I haven't run into that problem - so far it's pretty much been plug and play. These xms3 even seem to pass 8hours of prime blend at just 1.5v.
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I'm going to need to test that also, but my Corsair XMS3 set appears to like 1.5v using the XMP settings built into them. I imagine that quite a few people have these sticks after OCUK (And others) had them for frankly silly prices.
 
Well, my chip literally will not go over 4.6GHz.

I tried loads of stuff last night all the way upto 1.4V to hit 4.7, to no avail - windows just freezes on the boot screen.

After reading all the stuff about Auto in this thread, out of curiosity I just set everything to Auto and set 47 multiplier and the same thing happens :(
 
I just attempted 4.6 too but it froze on the windows logo also. Ah well no biggie for an extra 100mhz :p

Anyone prefer auto LLC as opposed to extreme and just compensating for vdrop by giving it more vcore in the first place?

I've just set 1.35vcore in bios and it's showing 1.336 in cpuz under load.
 
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MikeHiow said:
Well, my chip literally will not go over 4.6GHz.

I tried loads of stuff last night all the way upto 1.4V to hit 4.7, to no avail - windows just freezes on the boot screen.

After reading all the stuff about Auto in this thread, out of curiosity I just set everything to Auto and set 47 multiplier and the same thing happens :(
Click to expand...

Out of curiosity what board is your chip connected to and is it the 2500k? While my CPU will happy boot (And be perfectly stable it seems, if I pump some scary voltage in the VCore) at 4.8ghz and possibly beyond, the voltage requirements are so silly I'd rather not take the risk, yet!

In all honesty, if you can get a 4.6Ghz OC with a semi-decent voltage I'd stop there and be happy, after all, outside of benchmarking and posterity, what use would an extra 100Mhz or so be, especially at the cost of some severely dangerous voltage?

Max3 said:
I just attempted 4.6 too but it froze on the windows logo also. Ah well no biggie for an extra 100mhz :p

Anyone prefer auto LLC as opposed to extreme and just compensating for vdrop by giving it more vcore in the first place?
Click to expand...
While I do not use "Level 1" LLC, the equivalent to Extreme on ASUS boards as it actually increases Vcore on load, Level 2 (Which keeps it about even) seems to work very well. Auto just causes too many issues and if you can keep Vcore as stable as possible, the better you can get stability imho.
 
Little update - I managed to break the the 4.7 barrier with 'Internal PLL Overvoltage' enabled.

Currently Prime'ing at 4.7GHz / 1.38V.

Oddly enough, temps don't seem to have increased much, either; sitting around 70-75c during Prime.
 
4.8 Seems to be stable enough to do 10mins Prime and 5xIBT at 1.38 (Well, it actually fluctuates between 1.36-1.38, seemingly spending more time at 1.36)
 
MikeHiow said:
4.8 Seems to be stable enough to do 10mins Prime and 5xIBT at 1.38 (Well, it actually fluctuates between 1.36-1.38, seemingly spending more time at 1.36)
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Nice one! However I would advise you to be careful! My CPU (Also an i5 2500k) was IBT stable at 4.8Ghz using 1.38v but would BSOD on idle with the dreaded "Uncorrectable Hardware Error" issues.

Now in my case I am waiting for ASRock to re-issue the 1.40UEFI, as it was pulled and while it introduced PLL Overvoltage like the ASUS boards, it didn't appear to work and the thing was massively unstable. I am back on 1.3 and sticking to 4.4Ghz @ 1.3v until I see an update on this regard.

If they can get it working and I can achieve 4.8Ghz on 1.38v I will certainly be happy, but I need to be patient and see what ASRock can do.
 
Well, I tried to go further, but it wouldn't do more than one run of IBT at 4.9GHz even all the way up to 1.4V. At 1.4, the temps are on the absolute limit that I'd really like to take them (75-77c) so it looks like 4.8GHz and 1.38 is here to stay unless I get bored later and invest in some better cooling.
 
ah yeah internal pll overvoltage let windows boot at 4.6ghz 1.35vcore for me - let's see if this survives some linx.
 
According to Stop It Rawr you can exceed 1.4V with no problems it seems and that Gibbo and Intel are clueless.

I was attacked for stating that 1.38V was the safe maximum voltage for 24/7 usage.
 
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