iOS Ref

RAM and processor by device

iPhone

Device Released RAM Processor
iPhone X 2017 3 GB A11 Bionic
iPhone 8 Plus
iPhone 8 2 GB
iPhone 7 Plus 2016 3 GB A10 Fusion
iPhone 7 2 GB
iPhone SE A9
iPhone 6s Plus 2015
iPhone 6s
iPhone 6 Plus 2014 1 GB A8
iPhone 6
iPhone 5s 2013 A7
iPhone 5c 2013 A6
iPhone 5 2012
iPhone 4s 2011 512 MB A5
iPhone 4 2010 A4
iPhone 3GS 2009 256 MB
iPhone 3G 2008 128 MB
iPhone (gen 1) 2007

iPad

Device Released RAM Processor
iPad (gen 6) 2018 TBD A10 Fusion
iPad Pro 12.9" (gen 2) 2017 4 GB A10X Fusion
iPad Pro 10.5"
iPad (gen 5) 2 GB A9
iPad Pro 9.7" 2016 A9X
iPad Pro 12.9" (gen 1) 2015 4 GB
iPad mini 4 2 GB A8
iPad mini 3 2014 1 GB A7
iPad Air 2 2 GB A8X
iPad mini 2 2013 1 GB A7
iPad Air (gen 1)
iPad (gen 4) 2012 A6X
iPad mini (gen 1) 512 MB A5
iPad (gen 3) 1 GB A5X
iPad 2 2011 512 MB A5
iPad (gen 1) 2010 256 MB A4

Apple Watch

Device Released RAM Processor
Series 3 2017 768 MB2 S3
Series 2 2016 512 MB S2
Series 1 S1P
Series 01 2014 S1

1 “Series 0” is a commonly used nickname for the first generation Apple Watch.
2 Unconfirmed as of January 2018, as no official figure is given.

iPod touch

Device Released RAM Processor
iPod touch (gen 6) 2015 1 GB A8
iPod touch (gen 5) 2012 512 MB A5
iPod touch (gen 4) 2010 256 MB A4
iPod touch (gen 3) 2009
iPod touch (gen 2) 2008 128 MB
iPod touch (gen 1) 2007

Apple TV

Device Released RAM Processor
Apple TV 4K 2017 3 GB A10X Fusion
Apple TV (gen 4) 2015 2 GB A8
Apple TV (gen 3) 2012 512 MB A5
Apple TV (gen 2) 2010 256 MB A4
Apple TV (gen 1) 2007 Intel "Crofton" Pentium M

HomePod

Device Released RAM Processor
HomePod (gen 1) 2018 1 GB A8