Hi,
My customer is curious as to what would cost more a 4 layer board or a six 
layer board. Here are the details:

Board has 1 gnd layer an 1 vcc layer and is primarily surface mount and a 
digital circuit without any critical paths. These will remain constant. The 
board was autorouted for both a six layer version and a four layer version, 
so here is the difference of 2 signal layers or 4 signal layers . The 4 
layer was routed to 96% and 2500+ vias and the six layer routed to 100% with 
1450+ vias. We all can surmise that the six layer version will be more 
reliable in the long run.  I am told that the cost is drilling alone is 
about a $100 difference per board. Can any body help with the cost analysis?

Thanks in advance,

Scott Shepard
Interactive Design Solutions
also at [log in to unmask]