Deliding 4770k?

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jarablue

jarablue

Member
May 3, 2004
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I am going to try and delid my 4770k. I wanted to know if, once delided should I sand down the IHS with some fine grit sandpaper to get any extra paste off?

Also will the motherboard cpu retention bracket hold down the IHS properly now that it is unglued from the pcb.

Going to do this tomorrow...wish me luck! :)
 
2

2is

Diamond Member
Apr 8, 2012
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Some people will sand down the IHS, not to remove the paste, that can be done with some rubbing alcohol and elbow grease, but to reduce the gap between the die and IHS which is the main culprit of the high temps.
 
GreenChile

GreenChile

Member
Sep 4, 2007
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Yeah you are thinking about it backwards 2is providing he is talking about sanding the inside of the IHS.

Also, sanding the nickel plating off the inside of the IHS is not recommended because the copper will be in direct contact with the CPU die. Any microscratches on the die can be an open pathway for the copper atoms to diffuse down to the transistors thus killing the CPU. It's a low probability but it can happen.

If the OP is talking about sanding down the outside of the IHS, no worries. Sand away my friend. It will give you a flatter surface but benefits are minimal.
 
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2

2is

Diamond Member
Apr 8, 2012
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I'm referring to sanding of the bottom edges of the IHS that mates with the PCB.
 
jarablue

jarablue

Member
May 3, 2004
120
20
81
Oh ok got ya. How much should I sand it down? Will the motherboard socket clamp even out the IHS so it sits evenly? Just worried that it wont be seated flush.

Thanks again :)
 
T

twjr

Senior member
Jul 5, 2006
627
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On my 3570k I only lapped the top of the IHS. I don't think there is any value in sanding the bottom edge of the IHS. After I had removed the IHS and the black silicone holding the IHS to the PCB there was actually a gap between the IHS and the PCB. Any sanding would increase that gap. The socket clamp seems to be holding the IHS pretty flat and square on my die as the load temps have dropped about 15 degrees.

PS. I found that soaking the black silicone with some thin silicone lube softened it a lot. So much so that after 5-10 minutes of soaking I was able to simply peel/scrape it off the PCB with my fingernail.
 
J

JimmiG

Platinum Member
Feb 24, 2005
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jarablue said:
I am going to try and delid my 4770k. I wanted to know if, once delided should I sand down the IHS with some fine grit sandpaper to get any extra paste off?

Also will the motherboard cpu retention bracket hold down the IHS properly now that it is unglued from the pcb.

Going to do this tomorrow...wish me luck! :)
Click to expand...

1. Just clean off all the stock thermal goop using e.g. a lint-free cloth and rubbing alcohol. It comes off easily. Same with the CPU die.
Some people will lap the *outside* or top of the IHS to make better contact with the heatsink/water block but this is entirely optional. Don't do anything to the inside of the IHS (the side that sits against the CPU die) other than cleaning it from thermal paste and epoxy.

2. Yes, the retention bracket is enough to hold the IHS in place. When you get rid of all the rubbery eopxy, the IHS will actually sit more flush and make better contact with the CPU die. This is the main reason temps drop. Clamping down the bracket is a bit tricky. The IHS wants to move and twist so you have to hold it in place on top of the CPU while you push down and latch the bracket. Once locked, everything stays in place.

My delid thread with pics:
http://forums.anandtech.com/showthread.php?t=2336474&highlight=
 
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hawtdawg

hawtdawg

Golden Member
Jun 4, 2005
1,223
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with IB at least, the glue that attaches the IHS seems to be the culprit. Get rid of that and your temps will drop by a huge amount. I lost 23C on my 3770K
 
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