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Technology Stocks : Rambus (RMBS) - Eagle or Penguin
RMBS 95.53+0.7%12:59 PM EST

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To: jim kelley who wrote (40609)4/23/2000 4:38:00 PM
From: Bilow  Read Replies (2) of 93625
 
For those not in the business, it isn't easy to figure out the worth of a pin. But I assembled some links to engineering papers that showed what the cost pins (in a package) were:

For a small chip, the cost per bump can be less than $0.002 vs. a wirebond that currently costs $0.003 to $0.005.
(02/98) techweb.com

Two of my ancient posts discussed this issue:
Falling costs of pins: (09/99) #reply-11393109
Design wins for MCMs: (09/99) #reply-11403964

The above indicates that the cost of an extra 100 package pins is a matter of a few dollars, possibly less than the cost of a single RIMM heat sink. In addition to the package costs, there are also motherboard costs. But in motherboard pin count, RIMMs have no advantage at all over DIMMs in hole count, and have a more complicated trace requirements. This is why it was such a big deal when the early RDRAM boards couldn't be put on just 4 layers.

I haven't updated the above links for six months, and will do so immediately. But you have to remember that packaging is a slow changing industry, in electronics terms, not a fast paced one.

-- Carl
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