The Micron chip is 9mm x 14mm (same as their older 4Gbit DDR3), and the Intelligent Memory one is 10mm x 13mm. Of course, if you are doing new PCB designs, you

The Micron chip is 9mm x 14mm (same as their older 4Gbit DDR3), and the Intelligent Memory one is 10mm x 13mm. Of course, if you are doing new PCB designs, you probably want to allocate the extra footprint so you are not stuck with a single source.