To be certain only burnin can answer this question is there going to be new 10 chips PCB version or same one will be used.
I can buy 15 chips more from zefir and I'm not sure if it is possible for a 20 chip board to work with only 15 chips placed on it.
Basically Im asking if it can work underpopulated and add later 5 chips more.
I won't do partial assembly, either 10 or 20.
Assembly cost can be paid in BTC or Eur. (Paypal, Wire Transfer)
Expect about 80 Eur assembly cost per module (that doesn't include chip cost).
For The 20 Chip Module expect about 100 Eur.
There will be the following order options:
1. Completed 10 Chip PCB with mounting materials and cooling solution
2. Completed 20 Chip PCB with mounting materials and cooling solution
3. Bare bones assembled 10 or 20 Chip PCBs for the DIY folks
4. Empty 10 or 20 Chip boards for hard-core DIY (If you ordered chips from Zefir i can send them together with the boards)
Ordering will be done through an dedicated website that is not up yet.
I'll announce the launch through my email newsletter.
Edit - added
But the material used isnt the main factor. The main factor is time and the price of production. Producing a small number of different pcb's wont bring an advantage. Its maybe the same price then. So its better to use the same pcb, get a lower price for producing it and populate it only with half the chips.
And i think users that order the bitburner X wont have problems with the space anyway. If they would have many miners they would order bitburner xx.
I agree on that one and I was thinking on space wasted on PCB.