One of the details that Apple doesn’t mention at their keynote event is how much RAM their new products will include, which means we get to find out later. Luckily for us, it has been confirmed that the iPhone 5 will have 1GB of RAM.
This was first reported by iFans, who reported it based on part numbers listed on the A6 chip itself, and was later confirmed by further investigation by Kyle Wiens of iFixit, who used Samsung’s own product guides.
The chart above is part of Samsung’s 2012 Product Solutions Guide, which lists part numbers of various memory parts for sale. The part number on the A6 chip in the iPhone 5 lines up with the family of 8 Gigabit mobile DRAMs which translate into 1GB of RAM. This is backed up by the A5 part being listed as 4 Gigabit, which translate to 512MB of RAM.
For comparison, the iPhone 4 and iPhone 4S both had 512MB of RAM to work with, half of what the iPhone 5 has. Running out of RAM causes performance issues as applications are purged from memory from time to time.