Does your 920D have a complete flat IHS ?

[jVIDIA]

Folks,
I've tried 2 diferent 920D cpu's with 3 diferent WC blocks (Cuplex XT, Storm and Apogee) and they all have the same problem : the IHS is not flat in the center !!

This is a problem because the contact between IHS and WC block is not made correctly in the middle of the cpu IHS!

Anyone has/had this problem ?!

[gone_fishin]

Same here, on mine only the edges make contact and there is a huge air gap everywhere else. The only solution I see is to lap it or settle for a very thick arctic silver layer which is not good. The stock air cooler has a round bottom and is only making decent contact at four points, not anywhere near optimal.
At least your waterblocks are making good contact around the entire edge.

[Sneaky]

follow this how-to that I wrote if you don't mind voiding your processor's warranty


http://www.overclock.net/faqs/15897-...-p4s-a64s.html







edit: but BTW, make sure you are mounting the block as hard as it will let you, and possibly get harder springs, or just hard mount the block without springs at all - the IHS is made to flex and will make better contact with a hard mounting - and don't worry, you won't hurt the core under it at all by mounting it with alot of pressure

[mr_knowitall15]

christ, thats terrible. Id tell intel that their IHS is crappy, and im gonna lap it, and if something should happen in the future, my warrenty SHOULD still be good. After all, lapping the IHS for much better contact and thusly temps, would be a lot better than not lapping it, having crappy contact and temps, and maybe the proc being damaged from heat. Try telling them that.

[JoeBar]

My solution is to apply a bit more ceramique and more pressure to the waterblock.

[jVIDIA]

But is this a production bug of the IHS or is it made by purpose ?

My P4 640 didn't had this problem !

Sneaky, are you saying that the IHS should bent to flattness with preassure ?

And I've read your lapping guide. I've done lapping to my Cuplex XT and it looks great (see here).
I've got 2 question for you : when lapping the IHS you didn't used water on the sandpaper wrigth ?! and the IHS are copper made ??

Now I'm with the AquaComputer Cuplex XT s775, and I'm afraid of putting too mutch preassure on it not because of the CPU but because of the waterblock it self. I'm afraid of bendding the suport's of the waterblock

[leejsmith]

are these cpu's retails or oem ?
if you look at the retail heatsink on the 9 series cpu some of them have smaller copper base than others and the smaller ones are smaller than the heatspreader so when the heatsink is pushing down it does not touch the 4 corners and they become raised. i have noticed on a lot of the 8 series dual cores i built in the last few months a circle pattern and the corners looking raised and high temps on non intel coolers like akasa evo 120.

[Sentential]

This is what mine looks like, notice how bowled out it is:

[jVIDIA]

They are retail boxed cpu's.

Don't understand WTF is Intel thinking by doing this !

Sentential, that's it !

[nicepun]

http://www.xtremesystems.org/forums/...=85992&page=10

Check out post #243. I better my temps by almost 10c by lapping the IHS. Yes, the edges on these procs are raised a little bit which prevents full contact with a heatsink. I hope they fix this with new procs.

[jVIDIA]

nicepun, did you used wet sandpapper ? Or did you lapped using dry sandpapper ?

[nicepun]

nicepun, did you used wet sandpapper ? Or did you lapped using dry sandpapper ?

Dry Sandpaper. It was hard work (a couple of hours) but I was happy with results.

[jVIDIA]

Do you guys know if lapping the IHS will void the warranty of the CPU ?

[nicepun]

Do you guys know if lapping the IHS will void the warranty of the CPU ?

Yes, specilly in Portugal where they try to find any possible excuse to void your warranty. I know because I lived there for three years. So unless you are planning to keep it for a while, or sell it to some one you know will buy it. I wouldn't do it.

[kyleslater]

I'm totally for lapping... and If I'm overclocking I'm not thinking of warranty...

[jVIDIA]

I do OC and I do care about warranty

[Byron]

most intel IHS's have that issue, have seen though the 6x1 series have a revised IHS which don't have this problem!

[jVIDIA]

This is insane

[Byron]

just lapped a 805d and his IHS seemed much better than my old s478 P4's, 630, 640 and 920!

[Lestat]

my original 3.2ghz 775 (i foget, thats a 530 i think or was it 550 ?) was like that too it was impossible to cool even on water.
the center of the heat spreader had a massive depression so that the heatsink only sat on the corners.

i took my drivers license and laid it across the heat spreader with the thin edge and took pictures,, sent them off to intel and never heard a friggin word.. i was VERY pissed off. there was an OBVIOUS massive gap at the center of the IHS, very depressing.. haha pun intended!

all the amd64 chips i been thru.... never ever had one do that.

[kyleslater]

my original 3.2ghz 775 (i foget, thats a 530 i think or was it 550 ?) was like that too it was impossible to cool even on water.
the center of the heat spreader had a massive depression so that the heatsink only sat on the corners.

i took my drivers license and laid it across the heat spreader with the thin edge and took pictures,, sent them off to intel and never heard a friggin word.. i was VERY pissed off. there was an OBVIOUS massive gap at the center of the IHS, very depressing.. haha pun intended!

all the amd64 chips i been thru.... never ever had one do that.

540...

[adeoliver]

Same problems here, Im still able to keep the temps bellow spec but my 830 had better load temps than this pig. I will be lapping this CPU as well here soon.

[Byron]

on my 920D i saw about 6-7oC difference at full load! substantial differnence using watercooling...

[wa77ss]

This is what mine looks like, notice how bowled out it is:

Sent, is that a XP-90c ? I have one and am getting a 930D soon, but I didnt know they worked with LGA775. I guess they do ?

[3NZ0]

Sent, is that a XP-90c ? I have one and am getting a 930D soon, but I didnt know they worked with LGA775. I guess they do ?

xp90c is all copper...


looks like an xp-120 to me, also there is an lga bracket for the range iirc