Apple doesn't give consumers any technical specifications (like RAM size, processor speeds, etc) about iOS devices. However, developers (and other tech savvy customers) have known for a while that the original iPhone, iPod touch, and iPhone 3G had 128 MBs of RAM, while the iPhone 3GS and iPad have 256 MBs of RAM. After all, developers need to know this information in order to develop quality applications. But, in a recent WWDC 2010 session, it was told that the iPhone 4 will have 512 MBs of RAM.
In a session entitled "Advanced Performance Optimization on iPhone OS, pt 2" (Session 147), which was posted yesterday to iTunes for developers, Apple confirms the previous rumors about the iPhone 4 having 512 MBs of RAM.
This is perhaps why the iMovie application will only be available on the iPhone 4, not the iPhone 3GS or even the iPad. The application could be making use of the extra temporary storage. Theoretically, the new display could be the main cause of the bump up in RAM as well, since Apple is asking developers to include higher quality artwork in their applications to take advantage of the new display.
via MacRumors
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