2500K instability issue

233Kosta

233Kosta

New member
Hey, guys and girls, I've had a 2500K for about 9 months now. I've overclocked the most I could out of this chip under my water setup and I've managed 5.4G at stupid volts for a validation so far.

My problem however arises at lower clocks. For 24/7 use I like to stay around 4.5-4.8, depending on what I'm doing. At my current "happy medium" 4.5, I get random blue screens, freezes and shutdowns. This is incredibly annoying, since I've tried to track down any source of instability I can think of, and thus far - nothing. :banghead: :banghead: :banghead: What's even weirder is that I can leave prime or IBT running 24/7 and nothing happens. It just quietly ticks away at all the maths thrown at it, however whenever I've got a low load condition for a prolonged amount of time - say an hour or two - just out of nowhere it freezes, sometimes during a BSOD crash dump.

I have no idea why it does that, can anyone help? :confused:
 
Needs more volts most likely you put so many volts through it is already wearing away. Why do you need to OC so much anyway? Just leave it stock and one day when videocards start bottlenecking then start OC'ing the hell out of it.
 
Well I've set what I could to manual, so the board doesn't go stupid on me. When I initially started playing with this chip the moment I touched the turbo multi - the Vcore shot up to 1.6, so then I just turned everything down to what I want it to be.

I've left the turbo settings to default, as well as LLC, SpeedStep and the rest of the power saving features.

In most of the cases I don't ever see a BSOD, it just freezes to death. It would occur when I'm watching something on youtube or a film. It just freezes the picture and slows down the sound playback until it freezes too.

Before I posted this thread, I upped the Vcore from 1.27 to 1.28 to see if it would help the stability at all, but alas - it crashed again, in the same manner, 15 minutes ago, so it's definitely getting enough power.

Btw, I've got this on a P8Z68-V/GEN3 with 6GB of Dominator GT 1866 CL9 memory.

Is there anything I'm missing here?
 
Try booting into and running linux from a disc, if the freezing continues then its most definitely a hardware thing.
Then try if you can grab a hold of another psu try that, then some different ram etc. Process of elimination really.
 
I've run it under linux before, but not long enough for it to cause issues. I mainly run linux for matlab and OpenFOAM. The RAM I've tested on a p7p55 with a 760, at 200x20 it ran perfectly happy 1.5V at 1600MHz - what I've got it at now as well.

Interestingly enough, now that I put 8GB of Mushkin Silverline - the RAM doesn't like the overclock and crashed all the time until I backed it off back to stock. But that's a different issue for a different thread.

I've just disabled all the power saving options and turned up the DIGI+ VRMs to 500kHz. I'll see if it survives the night and try a few more things tomorrow, but for me it's bed time now (lol 06:30 is a ridiculous bedtime, but I guess I'm a nocturnal animal)
 
6GB? on a Z68 board? 2x 1GB and 2x 2GB arrangement?
MEMTEST memory, lately?

does this happen when system is stock?

i'd be interested in the BSOD code or look into the windows event viewer for
freezes and halts with no blue screen.

airdeano
 
I got a triple channel Corsair kit a while ago(3x2GB ). It's supposed to run 1866 at 1.65V, but I've had it at 1600 and 1.5V for the past few months. I ran memtest in September for the best part of 8 hours and didn't see any issues with it, it seemed quite happy at that, so I left it. I was still having the odd freeze back then as well.

I'll check out the event viewer some time tomorrow and let you know.
 
you might wanna drop 2GB outta the system and retest. the memory controller
is so confused.. running DDR on one channel and single channel on the other.
DDR is most functional in pairs. and when not paired, the controller has to make
special instruction for the single module..

1.65v RAM, undervolted to 1.5v, triple channel on XMP timings, prolly..
i'd pull a module, revolt to 1.65 and retest.

airdeano
 
I agree with airdeano, take out one ram stick to run dual channel setup.
Maybe try turning of the power-saving features and play a bit with the LLC to see if it helps.
 
This sounds like an idle state voltage issue to me - i.e. your LLC is set sufficiently high to support the CPU under load but the vcore isn't enough at idle.

I'd suggest adding a tiny bit to the Vcore and setting a slightly softer LLC to reduce the added volts under load (lowering the LLC might be too much given the tiny amount of Vcore I expect to be added but worth a try).

233Kosta said:
I've left the turbo settings to default, as well as LLC, SpeedStep and the rest of the power saving features.
Click to expand...
This might not be helping either - if you are going for a manual OC then I'd suggest you turn off Turbo/Speedstep and any offset voltage option too. God knows what the motherboard will try and do on top of what you set. That might also explain how you saw 1.6v when you first played with the chip - setting 1.x for your overclock with offset voltage on and the motherboard automatically added volts to that too (settings on auto doesn't mean it is intelligent!)
 
Last edited:
I added 10mV last night, but it still crashed. After that I manually set the VRMs to their maximum frequency and so far it's stable. I also switched off all the EPU features, but I've left some of the Intel multiplier based power saving options. I've switched off Turbo and just left the basic multi at 45.

As I said - so far it's stable. I'm currently running a disk check on a dodgy HDD and it's literally taking forever. When it's done - I'll change a few more things. I do see the Vcore staying at what I set it to in BIOS under full load and slightly higher when load is removed until LLC turns down(few seconds).
 
I got my 670 in September. put it in the loop with the CPU and I've not had a single non overclocking issue with it. I did get the occasional crash when going too far on the clock, but that's to be expected.

My sound card however did start to pick up a lot of noise after I installed the GPU, but that's to be expected too since it's unshielded.

As stated before - when under load it runs like a treat, but the moment I return to idle - problems start.

I noticed that that the motherboard likes to do what it feels like, so that's why I locked down all the voltages to manual.

When the disk check is done and I can restart, I'll switch off every power saving feature and tweak the LLC to see what happens. I don't know if I should mess around with it, since it's been well balanced on auto, but I will try it.
 
By the way, guys, does anyone know what the default Vcore for a stock i5 760 is supposed to be? My sister's build is based around that and the P7P55D is being stupid with Vcore.
 
Hey, guys, thanks for all the help!

Once that turbo was off and all the power saving stuff went with it - rock solid. I left it running over the weekend when I went to visit family - found it as I left it ^_^

Thanks again!
:worship: :worship: :worship:
 
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