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FC-PGA Heatsink Concern

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November 11, 2000 9:10:03 PM

This is my first post!
I was wondering if anyone has experienced overheating with the Pentium FC-PGA package.
I installed a boxed Pentium processor in my computer recently and I was not impressed with the supplied heatsink.
It does not apply very much pressure to the processor package. The heat sink slides with very little pressure applied by finger touch.
Should I be concerned?

Thank You

More about : pga heatsink concern

November 11, 2000 9:14:32 PM

Definately. A heatsink should sit very snugg against the core of the processor, or else you won't conduct heat away from the CPU very well. Are you using thermal paste also?
November 11, 2000 10:57:50 PM

The paste was pre-applied.
The heatsink clip required effort to attach to the cpu socket. I was cautious with the installation because the motherboard would flex from the pressure required to seat the heatsink clip to the cpu socket.
I switched out a 566 Celeron with a 750 Pentium III. The heatsinks are nearly physically the same. Except the heatsink with the Pentium is anodized black alluminum alloy vs the Celeron was raw cut alluminum alloy.
I was hoping the heat paste was acting like a lubricant between the processor package and the anodized surface of the heatsink.
I have read articals about the flip chip package stating that when installing the heatsink you have to be very careful because the processor die is exposed.
I noticed that the die is raised from the surface of the pin grid. Only the raised surface contacts the heatsink.
Personally I have doubts that this is a good thermal solution. As I prefer a heatsink that is glued directly to the processor and anchored by a retaining clip. That is why I was concerned with the effiency with this new style thermal solution.
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November 11, 2000 11:04:30 PM

They make copper shims that make heatsinks fit a lot better on socket cpus. It basically makes the entire top of your processor flat and level. I think they sell them at www.cpufx.com. It's only 5 bucks, and could save you from potentially damaging your processor.
Anonymous
a b à CPUs
November 21, 2000 2:30:46 AM

Thanks Magus, this helped me as well.

I am currently installing, for the first time, the fan that came with a new FC-PGA PIII 800 and I couldn't believe that I am supposed to clamp down a heat sink ontop of an exposed silicon waffer. Not only was I having trouble with the idea of possibly crunching the exposed chip like a waffer-cookie, but the fact that only a very small area is touching the sink doesn't make sense to me. Very questionable design I say.
Anonymous
a b à CPUs
November 21, 2000 2:25:23 PM

I had a retail P3 750 FC and the thing came with a gigantic heatsink! I fitted it what seemed like properly onto the processor on a very nice MSi motherboard.

The heat was rising dramatically and it crashed in the BIOS after 5 seconds...

I later found out by looking carefully that the heatsink was so huge that it was resting against a couple of the nearby set of capacitors positioned as normal around the socket370! This was preventing the heatsink from lying completely flat and didn't contact perfectly with the P3..

I slung that and bought a real generic heatsink and fan that works to this day just fine..
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