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debating wether to de-lid & lap my cpu IHS

post #1 of 25
Thread Starter 
hi , yes i am talking about the rig in my sig

today i noticed the max voltage is +.16v in my bios....

so it will not allow me to overvolt to 1.35 volts? i wouldnt leave it there, i just wanted to see if i could push it further.

now my question is, at 4.6ghz +.12v its stable. when i up to 4.7 +.16 i get a bsod after about 2min of prime 95...



could heat be making my rig unstable?
its currently doing 4.6ghz at +.12v with no temperature raising above 71 celsius (it should be good up to around 90 celsius i thought... at least 105 is the TJ max i think, not that i would ever let it run that hot for an extended period of time.)
or do you think my chip just wont go above 4.6ghz ?

i already have razors and 400-700-1000-1500-2000-2500 grit sandpapers lined up to remove the IHS and lap it down to a mirrored finish and make it ultra flat.... with phobya hegrease extreme for both under and over the IHS.
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post #2 of 25
If you are running at 70c on the cores then I really wouldn't worry about de-lidding it.

That is if those temps are on prime95... If they are just your playing a video game temps then... do something to cool it down. But it sounds like you mean while in prime95.

I know you already know this but outside of prime95 you are not going to hit those temps so I really wouldn't worry about de-lidding it. Although if you feel the urge then go for it. Just remember that even though you will probably be fine there is always that chance.

Same goes for lapping. I will say that IMO lapping made a huge difference on my 2500k and I can't be certain about my 920 but the temps seem to be lower than I originally expected them to be in prime95 at 1.35v and a very very old water block (Swiftech GT).

Also just FYI (not sure if this is common) but after lapping the lapping job seemed to make a big difference on certain cores more than others. Meaning that the first 2 cores dropped significantly but the last 2 didn't seem to drop very much this could be because I didn't take enough off but I am the super duper cautious type and was mostly only lapping the 2500k to get a nick out of the lid that the previous owner made.

If you fear not then I would say do it because as long as your don't break it you can't make it worse (because it is already really bad). I doubt you will get a higher clock speed but lower temps are lower temps and for me it is like my own benchmarking competition.

I know sub 50c temps on the cores are silly to shoot for but it is fun and for someone who can't afford to replace components it is my own extreme benchmarking competition only I am the only competitor.

Good luck with your decision.

Also let it dry for a long time after lapping just in case you got water in an area that isn't visible.

I traded my lapped 2500k to a friend because he needed a super cool running cpu that could hit 4.4GHz on a dirt cheap board. I just told him to buy me a new 3570k and he could have it since my cooling system is way overboard.

I have not lapped or de-lidded yet because I just don't like taking chances. But I will after I have had it for 3-6 months as it I will become bored.
Edited by givmedew - 1/23/13 at 3:21pm
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post #3 of 25
Quote:
Originally Posted by fade2green514 View Post

hi , yes i am talking about the rig in my sig

today i noticed the max voltage is +.16v in my bios....

so it will not allow me to overvolt to 1.35 volts? i wouldnt leave it there, i just wanted to see if i could push it further.

now my question is, at 4.6ghz +.12v its stable. when i up to 4.7 +.16 i get a bsod after about 2min of prime 95...



could heat be making my rig unstable?
its currently doing 4.6ghz at +.12v with no temperature raising above 71 celsius (it should be good up to around 90 celsius i thought... at least 105 is the TJ max i think, not that i would ever let it run that hot for an extended period of time.)
or do you think my chip just wont go above 4.6ghz ?

i already have razors and 400-700-1000-1500-2000-2500 grit sandpapers lined up to remove the IHS and lap it down to a mirrored finish and make it ultra flat.... with phobya hegrease extreme for both under and over the IHS.

it's not the heat thats causing the stability issues it's the heat that is holding back your ability to compensate for the stability without letting you pump more vcore in. At 70C highest temp for those Ghz... thats far to hot for me. I have dealt with those crazy temps before and they are nothing but trouble. do you and your chip a favor and drop those temps by dropping the lid and showing that chip some love. thumb.gif

Also... I don't recommend lapping just in case of chip issues. so just to be safe wait on the lapping for a bit.
post #4 of 25
Thread Starter 
well i was going to pop the IHS off and then lap the IHS so it'll be even less risky than popping the IHS off. in both cases im voiding the warranty so watever lol
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post #5 of 25

It shouldn't be heat making it unstable. Also, if you de-lid it, you do not want to lap the die.

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post #6 of 25
also telling everyone your offset voltage gives no clue what your voltage is. what does cpu-z say your voltage is ?
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post #7 of 25
Thread Starter 
we're looking at 1.31V maximum possible vcore. right now i have it set to 1.26 because its stable with that voltage at 4.6ghz but at 4.7ghz no matter what voltage i choose it becomes unstable.

also , why can i not lap the IHS ? i wont be doing the underside just the top. you see, from my experience the top of the IHS requires a ton of TIM because its concave not flat. i just want it to be flat.
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post #8 of 25
Quote:
Originally Posted by fade2green514 View Post

we're looking at 1.31V maximum possible vcore. right now i have it set to 1.26 because its stable with that voltage at 4.6ghz but at 4.7ghz no matter what voltage i choose it becomes unstable.

also , why can i not lap the IHS ? i wont be doing the underside just the top. you see, from my experience the top of the IHS requires a ton of TIM because its concave not flat. i just want it to be flat.

You don't need much TIM at all really half a rice grain or a small line is all really.... your 4.7 I bet is from heat. With Ivy as you get hotter it becomes harder for the chips to stay stable under the heat. So the cooler the better.
post #9 of 25
Thread Starter 
you need more without lapping the IHS though is what im saying. a half of a grain of rice or a small line is too much for a lapped IHS.

the copper is like 20 times as efficient at conducting the heat than any TIM.
Quote:
Originally Posted by nvidiaftw12 View Post

if you de-lid it, you do not want to lap the die.

i dont understand why not
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post #10 of 25
Quote:
Originally Posted by fade2green514 View Post

you need more without lapping the IHS though is what im saying. a half of a grain of rice or a small line is too much for a lapped IHS.

the copper is like 20 times as efficient at conducting the heat than any TIM.
i dont understand why not

very little gain and takes lots of time to get it right. plus only need it IF your IHS is concave or convex. put a flat blade to it to see which.
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