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The A8 was definitely manufactured by TSMC in TAIWAN!~
The part no. of SDRAM (F8164A3PM-GD-F) can be found on the right of Apple A8 SOC.
According to the datasheet, F is the product family (Mobile LPDDR3 SDRAM); A is the power supply interface (1.8V and 1.2V); 3 is the revision; PM is the package code.
This SDRAM should be a customized product with customized package (the SDRAM in Apple A7 SOC is F8164A1PD while the standard part no. is F8164A1MA).
'8' stands for 8Gb=1GB (for 2GB SDRAM, the part no. will be 'A')
"64" stands for 64-bit data width (for 32-bit SDRAM, the part no. will be "32")
The datasheet of Elpida SDRAM can be found here: http://www.micron.com/-/media/documents/...
RAM is 1G according to the part no. F8164A3PM-GD-F (8 stands for 8Gb=1GB)