This question 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?
Asked
Active
Viewed 279 times
1 Answers
4
The RAM on the Raspberry Pi 2 is not underneath the Broadcom chip, it's on the underside of the Pi.
recantha
- 4,489
- 20
- 26
-
So they stopped doing PoP, do you know why? – Phil B. May 07 '15 at 15:51
-
I think it was a matter of cost. PoP is quite expensive. – recantha May 07 '15 at 20:08
-
PoP limited the memory to 500M because this was the largest package available. – Milliways May 07 '15 at 23:28
-
AIUI the reason for moving the memory to the bottom of the board is that the processor die was too big to fit in the PoP package. – Peter Green Jul 08 '16 at 23:07