So you're saying that current graphics hardware, since it renders at 25ms on average is limited to 40 frames per second? You want him to be right. That's why you're agreeing with him, you really deep down want him to be right. I'm sorry, but he isn't right no matter how much you want him to be. You really want Titan to have less frame latency than the 690 IMO.
Sorry that's just not how it works. Because you want him to be right, proclaiming it so doesn't suddenly change the fact that unlike terms are the basis of his equation.
His equation has unlike terms (s and ms) on both sides so it is impossible for it to be correct. Furthermore, you're suggesting that current graphics hardware is limited to 40 fps. You and I both know that is completely ludicrous.