Not sure if i should lap my 920

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Soldato
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i got a pretty good i7 920

default vcore is 0.950 and its stable at 4.0 1.190 HT on and 4.2 @ 1.230 HT on

the only problem is the temps are high even with a lapped TRUE

at stock the thing idles at 39-42c and overclocked it idles at 46-48c and loads up at 83c under prime/linpack

i think the IHS is the problem

dsc00009croped.jpg


looking at the pic it seems there is a lot of TIM around the edges but hardly any in the center

the thing is i had a great clocking lapped Q6600 before this and i found it more difficult selling on than i thought as it was a great clocker

i saw worse clocking unlapped Q6600 sell for more on the MM

has anyone here sold a lapped cpu in the past was it more difficult or maybe there was no demand at the time i posted it
 
i though the lack of TIM in the center showed the contact was bad

lol looks like i was way off
 
Sold a lapped q6600 (3.8ghz capable) for £100.00 on MM a few months ago. was snapped up in no time whatsoever, 1.2750 vid certainly no golden stepping chip.
 
I can't see lapping making your temps better either.

Doesn't sound too high for an i7 at 4.2ghz on air to me. Maybe have a look at you air flow to see if you can bring the temps down?
 
Surely where there is hardly any TIM is where is is making contact and the edges where there is a build up is in the gaps?
 
I'm having a similar dilema. i just took the HSF off the cpu as i was installing the northbridge fan on my p6t duleux v2 and when i looked at the bottom of the HSF i saw this (its a TRUE btw..)
30072009790.jpg

as you can see theres a concove band where its making good contact with the CPU but there's the two arcs where there seems to be no contact. not im pretty sure its not the cooler as i when i had in on my e8400 it would make a perfect square of paste....

when i look at the chip it doesnt look curved.. could it be because of the locking mech on the mobo? as anyone who has the same mobo as me knows u need to put a lot of effort in to clamp it down, so could the brackt be bending the ISH on the cpu? has anyone else had it as bad as this? should i lap or maybe send it back and get a new one? what to doooooo :(
 
You probably want to lap the TRUE, but not the processor. That will take you a while mind, took me a couple of hours with a lapping table.

You can hold a razor/other straight thing across the surface, hold it up to the light and look for gaps between the razor and the heatsink/heatspreader
 
JonJ678 said:
You probably want to lap the TRUE, but not the processor. That will take you a while mind, took me a couple of hours with a lapping table.

You can hold a razor/other straight thing across the surface, hold it up to the light and look for gaps between the razor and the heatsink/heatspreader
Click to expand...

but as i said, on my e8400 there was perfect coverage, i.e a nice solid square of paste left on the the HS so its more likely to be the processor, and as i said im wondering if its the cpu housing on the mobo pressing down so much its actually bening it a bit?
 
right well before i went to sleep i did a bit of stress testing, after about 20 mins the tmeps topped out at about 63,60,59,51. thats on 2.67ghz with stock volts. so im pretty sure i shopuld prob to something to get then temps better. so shall itry lapping the HS first and then see if it improves?

not too sure about the washer/penny mod as it gets down pretty damm tight anywho. swear it's the mobo bracking bending the IHS.....
 
The ihs is not being bent by the mounting pressure, not a chance. That's 3mm thick copper.

After you lap one or both, it might not be so tight anymore. The reason we're recommending lapping the true first is because warranty on a heatsink is worthless, as there's nothing to go wrong. Processors don't break often but it does happen
 
ahhhh right o :) shall get lapping this weekend then :D... so if i do lap and it's not any better would that mean it's the chip? can i RMA it and ask for a non crooked one xP ??
 
Sasso said:
ahhhh right o :) shall get lapping this weekend then :D... so if i do lap and it's not any better would that mean it's the chip? can i RMA it and ask for a non crooked one xP ??
Click to expand...

Yeah good reason to rma in my opinion get them to check the next one before they send it out :)
 
JonJ678 said:
The ihs is not being bent by the mounting pressure, not a chance. That's 3mm thick copper.
Click to expand...

is the ISH inside the metal face... of is that the metal surface the cooler sits on? cos if itsa inside then i meant the metal outter bit xP
 
Rma because the surface is uneven will be rejected with laughter, it's operating within spec it's just running hot when over a GHz over stock.

The IHS integrated heat spreader is the piece of nickel plated copper sitting on top of the core. It's the largish block of metal on top of the chip, it's soldered to the core and normally has thermal paste between it and the heatsink.
 
JonJ678 said:
Rma because the surface is uneven will be rejected with laughter.
Click to expand...

aww boo xP im sure ive read people who have sent them back for this reason. as although it's functioning proplerly is it not more at risk because it's not making full contact. that is a flaw in my opinion.

also right i got some P800A grade sand paper.... will that be fine enough? as i have brasso and rags so to get it shiny i can buff the poo out of it :p
 
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Don't put brasso on it. It attacks the surface, you don't want that.

800 will be fine, you're aiming at flat, not at shiny. Shiny is nice but not as important as flat

You might be able to make a case for rmaing it, but it'll be tricky to explain why you're so worried about a couple of degrees without admitting your overclocking the chip, which I think they'll frown on. Do let us know how it goes if you try it
 
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