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Ultra-120 Extreme - Base Issues

post #1 of 9
Thread Starter 
Hey Guys-

I've been reading/hearing a very common complaint on many forums, about how the Ultra-120 Extremes have a base that is not very flat. They tend to be a bit concave.

This fact has been confirmed to me, having checked a few when we had them in stock. Indeed, they all seem to be at least a bit concave. At first glance, this would lead you to believe there were some quality control issues going on, as the prevailing opinion is that flat = good.

I brought up this issue to our Thermalright rep today, and it turns out this is done intentionally, for two main reasons:

1 - As most of you know, the IHS on the chips are rarely perfectly flat, and tend to be slightly convex. Thus, convex IHS + concave HS gives a better contact, in general.

2 - The concave shape helps keep it from "sticking" to the IHS. Some of you may have had problems in the past, when the Heatsink is seated for any length of time. Sometimes it's hard to get it to release, and some have damaged processors this way. The concave shape of the base is supposed to help reduce this.


The actual benefit of shaping the base this way will likely still be debated by people, and you're obviously free to draw your own conclusions - but ultimately, the shape is not due to lack of quality control, it's an intentional design. Hopefully this helps clear up some of the frenzy!
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post #2 of 9
Good to know, thanks rep to you
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post #3 of 9
Actually my Extreme is Convex (Bulging Outward), I figured it was done by design, makes sense.
I've posted in a few threads stating my opinion on the base design, that's why I did not lap mine.
I have very very good temps
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post #4 of 9
THat;s interesting, now what's the best way to find out whether your CPU and HSF is convex or concave?
post #5 of 9
Quote:
Originally Posted by Betrivent View Post
THat;s interesting, now what's the best way to find out whether your CPU and HSF is convex or concave?
Take a straight edge to it.
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post #6 of 9
or the water meter thingie
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post #7 of 9
Yeah, I have the Ultra-120 Extreme, and noticed it was a little concave. I was going to lap it but then looked at my e6600. The IHS on the e6600 is definitely somewhat convex. It seemed they matched up pretty well, so I left it. My CPU Idles at about 28-29C (at 3.0GHz and 1.29 Vcore), no lapping.
    
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post #8 of 9
Thanks I have heard that around now I know whats up.
    
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post #9 of 9
Quote:
Originally Posted by tankguys View Post

1 - As most of you know, the IHS on the chips are rarely perfectly flat, and tend to be slightly convex. Thus, convex IHS + concave HS gives a better contact, in general.
i mentioned that a few times
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