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Cracking line on i7 960 die - Page 2

post #11 of 43
Try other voltages; depending on what BSOD's you get you need to mess with different parts.

Did you sand the IHS before that and it wasn't enough?

Also, how are you cooling now? With the IHS back or without?
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post #12 of 43
Quote:
Originally Posted by foxrena;14253542 
Haha, I thought the top layer should be pretty thick. Sanding it down should help the temperature.

I'm a little disappoint cause my i7 920 can do 4GHz at a low voltage. The only advantage now with this 960 is that it puts out less heat at the same clock.

I uh...

I'm really amazed that thing still works...
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post #13 of 43
Thread Starter 
Quote:
Originally Posted by djk11;14253527 
1.35V is Intel's recommended max for VTT, but its not uncommon to need up to 1.4V. What BSOD codes are you getting?

Oh, I got many different BSOD codes from time to time... so I cannot really have any information from that. I have tried different Vcore VTT combinations too. It is very stable at 4GHz with 1.32V, 4.2 gets unstable no matter how high the voltage
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post #14 of 43
Also; is that a C0 or a D0 chip?
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post #15 of 43
Thread Starter 
Quote:
Originally Posted by shnur;14253544 
Try other voltages; depending on what BSOD's you get you need to mess with different parts.

Did you sand the IHS before that and it wasn't enough?

Also, how are you cooling now? With the IHS back or without?

I didn't sand the IHS. I removed it and sand the die directly... it was scary
I ruined my 920 before that.

Cooling has improved about 8C on cpu core compared with my 920 at the same voltage and clock.
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post #16 of 43
Thread Starter 
Quote:
Originally Posted by shnur;14253589 
Also; is that a C0 or a D0 chip?

Actually.. I'm not sure about that. I thought all 960 are D0 chips.

The product code on the cpu box says "BX80601960"
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post #17 of 43
You might just have a weak chip, it happens. Know the batch number?

If you damaged it physically by lapping it too far it would probably be unstable even at stock or not even be able to POST, so I don't think thats the problem.

If temps are ok try VTT up to 1.45V and VCore up to 1.5V, one notch at a time, testing with Linpack at each step, just to see if you can get stable, not as a 24/7 OC. Can try to lower your CPU PLL. Also vIOH may need a bump. Just keep a close eye on temps and stop testing if you get too high into the 80C's. Write down any BSOD codes, sometimes they can indicate the problem.
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post #18 of 43
Be very careful when lapping the die.

I wasn't careful enough cleaning my work area between grits while de-lidding my best i7 920 with sandpaper and I scratched the die in a way very similar to what's in the OP's image. All it took was one grain of abrasive significantly larger than what I was working with.

Chip worked fine for a few more months, but the thermal cycling an CPU undergoes meant that the scratch eventually developed into a crack, and that crack propagated to the other side of the die, killing the chip.
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post #19 of 43
Quote:
Originally Posted by Flying Donkey;14253525 
No guys you're reading his post wrong, he removed the IHS and polished that. NOT the die. And pics wouldn't hurt
From what I read, he was polishing the die. That picture he posted appears to be a sanded die. I'm not sure if all modern CPU dies are like this, but they're usually colored and shiny and reflective like this (this picture doesn't show it as well).

KL_Intel_Pentium_III_Coppermine.jpg

The picture the OP posted looks more like sanded metal now.

I thought the die was the transistors themselves under a very thin layer, more or less? How is it still working?
Quote:
Originally Posted by foxrena;14253591 
I didn't sand the IHS. I removed it and sand the die directly... it was scary
I ruined my 920 before that.
If you did this before and ruined a CPU, why did you do it again?
post #20 of 43
Quote:
Originally Posted by foxrena;14253591 
I removed it and sand the die directly.


You sanded the die itself?

mother-of-god-super-troopers.jpg

I think your CPU's days may be numbered...
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