This question about Package-on-Package RAM/CPUquestion about Package-on-Package RAM/CPU got me curious: My rPi B has the Samsung RAM packaged on top of the Broadcom (as I can read the Samsung product details off of the package). My rPi 2 B has the Broadcom on top of the RAM (as I can read the Broadcom product details off of the package). Is there a reason why the stacking order is different between versions, or is it different from batch-to-batch?