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Can't have stable overclock past stock on 2500k even on idle. Help!

post #1 of 7
Thread Starter 
Hi guys!

My specs:

i5 2500K
Z68 Extreme3 Gen3 (bios at lastest)
CMY16GX3M2A2400C11 @ 2133mhz 1.65v
Antec Neo Eco 620w
Windows 7 Ultimate 64-bit SP1

1. Had this system for 5 years now and only decided to OC is recently.
2. I've been able to pass prime95 4.6ghz at 1.4ish volts no problem for hours (the ingame fps improvements are amazing!)
3. I followed the Complete Overclocking Guide: Sandy Bridge & Ivy Bridge which uses turbo voltage method. Worked fine at load, but randomly crashes at idle. Even with clocks at conservative 4.2ghz.
4.I tried doing fixed voltage method at 1.45 volts (considerable .05+ vdroop) even at 4.2ghz and it would crash randomly at idle.
5. Tried LLC settings even level 2 and 1
6. I tried different power saving states in the above guide, altering pll voltage and max power settings with no luck in stability.

I'm really stuck and feel like chucking the whole system in the bin for a skylake build (which wouldn't be much of an upgrade if this OC worked). Do you guys have any ideas?
post #2 of 7
Quote:
Originally Posted by tj990 View Post

Hi guys!

My specs:

i5 2500K
Z68 Extreme3 Gen3 (bios at lastest)
CMY16GX3M2A2400C11 @ 2133mhz 1.65v
Antec Neo Eco 620w
Windows 7 Ultimate 64-bit SP1

1. Had this system for 5 years now and only decided to OC is recently.
2. I've been able to pass prime95 4.6ghz at 1.4ish volts no problem for hours (the ingame fps improvements are amazing!)
3. I followed the Complete Overclocking Guide: Sandy Bridge & Ivy Bridge which uses turbo voltage method. Worked fine at load, but randomly crashes at idle. Even with clocks at conservative 4.2ghz.
4.I tried doing fixed voltage method at 1.45 volts (considerable .05+ vdroop) even at 4.2ghz and it would crash randomly at idle.
5. Tried LLC settings even level 2 and 1
6. I tried different power saving states in the above guide, altering pll voltage and max power settings with no luck in stability.

I'm really stuck and feel like chucking the whole system in the bin for a skylake build (which wouldn't be much of an upgrade if this OC worked). Do you guys have any ideas?

I'd say maybe either the board or the cpu cant handle it. 1.45v is ALOT of voltage and if you cant hold stable at 4.2 with that then either there is a setting wrong in the bios or it just cant be held anymore, but try locking the clock at 4.2 or 4.6 straight with no downclocking and see if it holds. if it still wont hold then i'd say either the board or the cpu just cant handle it for whatever reason. try setting the bios to its defaults and just try from scratch again, maybe something somewhere got screwed up and you didnt notice? but a new skylake build would be a all around improvement and it would be a pretty substantial improvement if you go with a overclocking chip. if you wantd you could also try aiting out for ZEN and see if that is worth getting over intel's offerings? just some ideas. hope this helps a bit, i know its not perfect but it is a bit tough to diagnose persay.
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Koji
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post #3 of 7
Thread Starter 
Yeah, 1.45 is definitely a lot and I kept it under the 1.5v limit according to the guide. I followed the Complete Sandy bridge guide very closely starting from scratch several times. I also attempted a few other methods shown on youtube for z68 overclocking.

If it can't hold for a random reason it's a bit of a shame. My performance almost doubled in CPU intensive multiplayer games at 4.5ghz and faster ram and it could hold for a couple of hours. It's definitely strange that it would crash randomly at idle EVEN with fixed voltage at a high number. Maybe there is just something that wasn't included in the guides that I'm missing frown.gif


Maybe it's possible that the cpu is so old now that it's had degradation. Although that can't be the case when people are OC the same 2500k's today that were even previously overclocked..
post #4 of 7
Quote:
Originally Posted by tj990 View Post

Yeah, 1.45 is definitely a lot and I kept it under the 1.5v limit according to the guide. I followed the Complete Sandy bridge guide very closely starting from scratch several times. I also attempted a few other methods shown on youtube for z68 overclocking.

If it can't hold for a random reason it's a bit of a shame. My performance almost doubled in CPU intensive multiplayer games at 4.5ghz and faster ram and it could hold for a couple of hours. It's definitely strange that it would crash randomly at idle EVEN with fixed voltage at a high number. Maybe there is just something that wasn't included in the guides that I'm missing frown.gif


Maybe it's possible that the cpu is so old now that it's had degradation. Although that can't be the case when people are OC the same 2500k's today that were even previously overclocked..

well do remember every cpu is different so it could just be that, but try resetting everything to default and just run a overclock that works but isnt too far to the limit so around 4.4 or less but set it so it doesnt idle down have it so it stays at that speed and voltage 24/7 and see if that fixes the instability at those points. if that doesnt fix it try lowballing the overclock and do 4.2 or less and try it again. aside from that idk, maybe someone else will have some other tips.
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post #5 of 7
Maybe it's the ram. My Sandy didn't like the ram at high clocks. Try turning it down to 1600mhz or even 1333mhz, so we know for sure it's not the ram controller that is failing.
post #6 of 7
Thread Starter 
Quote:
Originally Posted by hlreijnders View Post

Maybe it's the ram. My Sandy didn't like the ram at high clocks. Try turning it down to 1600mhz or even 1333mhz, so we know for sure it's not the ram controller that is failing.
I think you may be right... I've set it back off the XMP profile to default 1333mhz. I've had stability with fixed voltage ever since doing so at 4.5ghz. What is the best method of overclocking the ram to check stability? 2133mhz XMP @1.65v , if that's crashing my PC at idle then I'm not sure how to approach stability. I did try and relax the timings on the XMP profile a while back but that didn't help at all.
post #7 of 7
Quote:
Originally Posted by tj990 View Post

I think you may be right... I've set it back off the XMP profile to default 1333mhz. I've had stability with fixed voltage ever since doing so at 4.5ghz. What is the best method of overclocking the ram to check stability? 2133mhz XMP @1.65v , if that's crashing my PC at idle then I'm not sure how to approach stability. I did try and relax the timings on the XMP profile a while back but that didn't help at all.

While I'm not sure, I think the max supported ram for Sandy is 1600mhz. Everything above that is just pure luck. Also, I would not use the XMP profiles. Just set everything manual. In your situation I would first clock the memory back to 1333mhz or 1600mhz with manual voltages and timings and test your cpu for stabillity at the desired speeds. Once you have the cpu stable, then I would start overclocking the ram. Just remember that on Sandy Bridge everything above 1600mhz ram is not guaranteed.
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