Ask him a simple question: How does a computer use RAM? If he answers that, then perhaps you'll be excused if you asked him the significance of having more RAM. Also, might he be knowing the need for a swapfile/paging file/virtual memory? Nkt
RAM is a temporary computing space. With multitasking, and larger RAM, several processes get to run and be completed as opposed to having to wait for "limited temporary computing space (low RAM)" to be available so that other processes can run.
How does he define "speed" in computing terms?
If he says more RAM does not help a computer, he should better go back to Abacus. I think it never required RAM:)
He should be stripped of the "techie" tag! I concur.