iPhone 4 has 512MB RAM
When it comes to making your computer go faster, often the cheapest and easiest thing to add is more memory. With the well-regarded A4 processor under the hood, Apple chose to double the iPhone 4’s available memory, which should make it a real screamer.
Whereas the iPhone 3GS and iPad both come equipped with 256MB, a [...]
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http://iphonetouch.blorge.com/2010/06/17/iphone-4-has-512mb/