OCUK Sandy Bridge, SB-E and Ivy Bridge 5GHZ Club

[1kiwi]

also I have the C1, EST features all on at the moment, should I turn them off?

No seems more stable with them on. I was experiencing random crashes (my clock is 1hr Linx stable) but I found that this was actually caused by my C300 and the Intel IRST drivers. I wasn't prepared to up the volts beyond 1.38v given the risk of CPU degradation.

 

[bobbydigital]

Out of the blue BSOD when you seem to be stable on full load will be when 1 core is maxing out and other aren't being used. This is where offset voltage comes in to play or using a lower LLC and higher max voltage.

 

[maddness]

No seems more stable with them on. I was experiencing random crashes (my clock is 1hr Linx stable) but I found that this was actually caused by my C300 and the Intel IRST drivers. I wasn't prepared to up the volts beyond 1.38v given the risk of CPU degradation.

hmm, this might explain why it bsods when installing stuff, im using a vortex 2e on the 6gbs channel, but shouldnt it still crash at 4.8GHz?

 

[maddness]

Out of the blue BSOD when you seem to be stable on full load will be when 1 core is maxing out and other aren't being used. This is where offset voltage comes in to play or using a lower LLC and higher max voltage.

from previous experience, when i/o craps out, it usually was that the i/o voltage boost solved it, might be similar for sandybridges?

mind you ive not done any real playing with it yet, its too time consuming fine tuning, i need a long weekend to play around with it

happy with 4.8GHz for now as its rock solid at safe volts

 

[bobbydigital]

Everything about sandybridge seems to be vcore imo, I can undervolt PLL stock settings for everything else also and stable with multiple processors.

Try what I suggested and use a higher offset voltage with a lower LLC setting and see how you get on as this seems to be the easiest way to fix light load problems.

 

[maddness]

offset voltage as in vcore?

how high 1.45v upwards? that's in territory

I've tried pll as low as 1.65v, should I try lower?

cheers

 

[maddness]

actually I've noticed something

when I prime or linx, it goes up to the full 1.440v

but when I run super pi, it doesn't uses all cores and the vcore goes to 1.424v

which maybe a little to low for 5GHz

so basically I should try removing speed stepping and try and keep the vcore at a fixed 1.440 for full load and low load

this might sort it, I think I'm onto something, oooooooohhhhh its all coming together now

 

[bobbydigital]

I'm not sure how your board works to be honest so used to asus at the moment. Offset is where it adds whatever you set onto the VID, which changes with load. Should look something like +0.01 etc

If you are using a manual voltage then my tips may not help at all, only other thing I can recommend is changing the level of LLC and seeing what happens.

 

[maddness]

ok well I turned eist / c1 off and set the vcore fixed at 1.43 and have been in windows gaming for just short of an hour and its not crashed once

its constant at 5GHz now and seems to be working perfectly, just starting up prime now

I dont think there is a offset option on this board

 

[The Asgard]

Umm this one seems quite nice. Only done a little testing but it allows the 55 multi at 100 blk in windows at 1.44v bios. Not stable, but looking promising.

Left it running prime at 5GHz 1.325v for a few hours but came back to a BSOD, but i don't think its far from stable.

That would make this rather a good chip if it can do low voltage at 4.8 / 5.0 GHz and yet still allow the 55 multi + Normally they permit none or one but I have not seen one do both before.

Just received my 26K and its a L102B285 so even more recent than yours. I have a Maximus IV on preorder and I will report back soon.

 

[Mnemonik]

Can I join the club?

Finally received my motherboard yesterday (Gigabye GA-P67A-UD5-B3) so I've started seeing what it can do. Primed fine at 4.9 overnight so I'm working on 5ghz now. So far it's looking good - Prime stable for 4 and a half hours.

It's set to 1.43V in BIOS and had to use LLC 2 to get it this stable. Temps are a bit high (peaked at 81 before I threw 2 more fans on my radiator), but I think I should be able to drop the VCC down a bit now that I'm using LLC 2 - I'll wait for 24hrs prime stable before doing that.

I was set on "5ghz or bust" and plan to run it 24/7 so I'm very happy that it looks like I've got an OK chip.

 

[Antilo]

5Ghz at 1.4v

Although running 4.5 1.3v for normal use.

 

[z10m]

Can I join.?

 

[1Day]

I see a whole new bunch of 5GHz club members are about to join. Nicely done lads and welcome.

 

[SimonMaltby]

welcome guys - members updated

 

[Mnemonik]

Spelt my name wrong

My 5ghz proved prime stable for 24 hours on small FFTs over the weekend. Working on 5.1 now and looking good.

No matter how many volts I throw at it, I can't get it even close to stable at 5ghz without LLC2 enabled...does anyone else see this in their overclock?

5ghz 1.45v LLC1 @ 5ghz = crash within 2 minutes in Prime95.
5ghz 1.42v LLC2 @ 5ghz = 24 hours prime stable.

Does it really make that much difference to load VCC?

The only reason I'd like to use LLC1 is LLC2 makes my temps go through the roof - about a 12 degree delta at load. I have a feeling I've used too much thermal paste so maybe I'll remount this week to get my temps down. The radiator isn't even getting slightly warm when i'm sitting on 78 degrees peak in my cores - tells me the block isn't transferring the heat as efficiently as it should.

 

[z10m]

5ghz 1.45v LLC1 @ 5ghz = crash within 2 minutes in Prime95.
5ghz 1.42v LLC2 @ 5ghz = 24 hours prime stable.

Check your voltage under load.! With llc on motherboard is pumping more voltage than you set in bios.
You might be well over danger zone and i wouldint stress it with prime for 24h with voltage @ 1.5v

welcome guys - members updated

thanx for adding me to the list but can you correct my name? I see myself as ]B]Z10m[/b]

 

[Mnemonik]

Check your voltage under load.! With llc on motherboard is pumping more voltage than you set in bios.
You might be well over danger zone and i wouldint stress it with prime for 24h with voltage @ 1.5v

Core temp reports my VCC at 1.39v when set to 1.42 LLC2. Is this likely to be accurate? CPUID doesn't report it at all because the problem reading B3 board voltage correctly.

 

[1Day]

LLC2 is not, and I stress not a good idea for 24/7 use. It for short bursts of activity such as those that nutters (benchers) will require.

 

[Mnemonik]

What evidence do you have to back that up? I've seen people for an against LLC, the best response I've seen was that on a good board (ie like mine, 20 phase power) with a decent power supply (which I have, Seasonic X-650), there shouldn't be any problem. From what I understand, LLC smooths out the power supply to the CPU so that there is no voltate drop under load. Is this not correct?

I know on older boards when LLC first appeared it caused spikes in power to the CPU and killing chips, but apparently it's not an issue any more.

That's a bit concerning as I've been Priming away for the last 60 odd hours or so with LLC2 on. I don't really want to melt my new CPU Maybe I'll try dropping back again and finding stability by throwing 1.45+ V at it instead.