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To: Mani1 who wrote (77885)	4/21/2002 11:01:05 PM
From: ptanner	Read Replies (2) \| Respond to of 275872

Mani, re: "Plastic can be casted which is very cheap." But wouldn't the additive materials counter the cost savings? It would seem to be a challenge to take plastic + diamond (for example, thanks Bill) and be more effective than straight aluminum which is pretty cheap based on prices of some heatsinks. And aluminum has a pretty low density for weight considerations - though it does sink <g>. (A reference to sink or float games with my daughter.) re: "For some application the build conductivity of the heat sink material is not the bottleneck. As is the fan and the junction between the die and the heat sink." You lost me on this one. Could you rephrase? -PT

To: Mani1 who wrote (77885)	4/21/2002 11:47:17 PM
From: Joe NYC	Read Replies (2) \| Respond to of 275872

Mani, As is the fan and the junction between the die and the heat sink. Hammer will have integrated heat spreader. What are the advantages, and can it be quantified? The way I see it, integrated heat spreader can: - protect the core from mechanical damage, as it is not exposed - larger area, higher heat dissipation, if heat sink gets detached, the mass and the area of the heatsink give the CPU more time to do what it needs to do gracefully - larger contact area with heatsink, helps conductivity. But isn't there some loss in conductivity from the silicon to integrated heat spreader that offests it? Joe

To: Mani1 who wrote (77885)	4/22/2002 12:09:30 AM
From: tcmay	Read Replies (1) \| Respond to of 275872

"Weight and ease of manufacturing. Metal have to either be machined or extruded. Plastic can be casted which is very cheap. For some application the build conductivity of the heat sink material is not the bottleneck. As is the fan and the junction between the die and the heat sink." Metal is trivial to cast. I suggest a few hours spent with a blowtorch melting and casting aluminum, pot metal, etc., as a useful laboratory exercise. Cast iron...gee, where'd they get _that_ name? Having said this, the new carbon nanotube conductors have a lot of advantages. But not because metals have to be extruded or machined. --Tim May