512MB - to retain battery life despite the new processor / chipset. The standby time seems to have gone down over its predecessor nevertheless. http://www.bus

512MB - to retain battery life despite the new processor / chipset. The standby time seems to have gone down over its predecessor nevertheless. http://www.businessinsider.com/iphone-4s-ram-2011-10 http://www.businessinsider.com/iphone-4s-ram-2011-10 [Edit] In the iFixit teardown article, step 8. How 'bout a close-up of that Apple A5 chip. 1 GHz Dual-core processor with 512 MB of DDR2 RAM... Yowza. How do we know it's 512 MB? Check out the marking, specifically E4E4, denoting two 2 Gb LPDDR2 die—for a total of 4 Gb—or 512 MB.