Help me get to the bottom of this temp issue (c2d)

[ui]ICEMAN

[ui]ICEMAN

[ui]ICEMAN

Soldato
Joined
18 Oct 2002
Posts
2,612
Location
Florida/UK
Hi,

Been having some issues with a 6600 I have and the Evga 680i SLI board. Using TAT and Core Temp I seem to be getting very high temps with a very very small increase in voltage. At 1.325v 3.4ghz under Orthos I'm getting ~58-60c on each core in TAT which I'm fine with. However, when stepping the voltage up even slightly to get 3.6ghz (1.4v and anything more) I end up with core temps rocketing to over 90c.

I've checked heatsink contact and I've even lapped the IHS to no avail. I'm using a Tuniq tower and I have a Zalman 9500 which I've tested too but still no joy. I'm tempted to whack it in the Vapochill and be done with it but I get the feeling there's something deeper amiss here. Perhaps poor contact between the cores and the IHS? I'm no newbie to overclocking, I've been playing with cascades, LN2 and phase change for many years and even on air, I've never seen temperatures rise so quickly with such a minor change in vcore.

Anyone have any ideas?
 
System is no longer stable at 1.4v 3.6 so I assume the temps are probably correct. Temp rise is incredibly rapid when load is applied, within 5-6s they're up from the idle temps of ~35-40 to 80+ @ 1.4v.
 
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Heatsinks are all relatively cool, warm under load and definitely hot with the fans off. Its looking like poor IHS - core contact isn't it :(

Its only a stop gap chip til my Kentsfield arrives anyway but still, I'd be tempted to keep this one if I could sort this issue. Warranty is void anyway, may as well remove the IHS and whack it under the vapo.
 
What's interesting is that I've heard reports of several others, both from this forum and others who have received 6600's this last week and had the same issues with temperature. In fact there's one literally right below this thread. Bad batch perhaps? Temps with no fan go up by a few c, nothing dramatic but I have reasonable airflow around my case.
 
Was very poor til I lapped the IHS, literally only one side of the CPU would leave an imprint with a fine layer, its nigh on perfect since the lapping though. I didn't have anything above 600grit to hand last night though so it was only a rough lapping to get the surface even.
 
Others are running substantially more than 1.4v though on similar or the same cooling, without the insane temperatures, I'm really puzzled by this one.
 
My temps as stated in the original post have always been from CT and TAT :( Temps are around 60c load now with 1.3v vfsb, 1.335 vcore @ 3.4ghz, guess this will have to do till my QX arrives later this week.
 
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