Last week, the Infinity Blade developer first suggested that the iPhone 4S still had 512MB of RAM, just like the iPhone 4:

"I'm still shocked that, with the iPhone 4S, I'm literally running around with a 1080p video camera in my pocket, with an eight megapixel camera, 64GB of hard drive space and an A5 chip with 512MB of memory. This is a really powerful computer, right?

The developer would be in a position to know as they had demoed their game on the new iPhone 4S during last week's keynote.

We had doubts about this claim, however, as we had previously heard that the new iPhone would carry 1GB of RAM. Note that we heard this alongside other information regarding Apple's Assistant feature that we accurately mocked up ahead of Siri's launch, so we were confident in the source.

But, now, AppVV also confirms that the iPhone 4S has 512MB of RAM. In a discussion thread an administrator reports that it has 512MB. This fact is repeated on their Weibo page as well in response to a question:

Re @ LogIn_Kim: RAM have said before, is still 512MB.

Though they don't detail how they came to the figure, we're inclined to believe AppVV as they are the ones who posted a hands-on video of the iPhone 4S this morning.