@natecull I was half way into writing a response pointing out the fact that the AGC had 48 kwords of storage. Then I realised you explicitly said RAM. So you're right.
But, just to give me a reason to comment on one of the more interesting machines of the 60's I will just mention that the word length of the AGC was 15 bits, so it was a bit more storage than 4 k may seem like.