I'm trying to recall at which point and time that NV specifically stated that this driver was supposed to precisely create the same increases that Mantle can in certain scenarios. Oh, wait. They didn't.
Much like everything else, most of the hype was fan based and website generated. Nvidia did their slides to demonstrate increases in key games, at no point in their slides did they state that their driver would do everything and anything Mantle does. It increases CPU efficiency and does just that, because DX11 has always had MT optimizations - those optimizations are incredibly difficult to implement from what I've read. This is partially the reason why AMD has not implemented it at all, but i'm not saying that in a negative connotation. Simply, it has taken NV years as a work in progress to get their MT drivers better and better and AMD still has not implemented MT (to my knowledge, I could be wrong, but this was true in 2012-2013). Anyway back to the driver. The driver does work with more than 1-2 games surprisingly enough. If it were Mantle, it would be one game and one game alone with an increase. With that stated, there are sizable increases in numerous games here. I'll take it. It's free, and it's driver, and it increases performance. Alrighty, sounds good to me.
No, it isn't mantle and nvidia never said that "this driver will over-take Mantle and make Mantle obsolete". These were fan based musings. Anyway, sure, you can Mantle does more in some respects. But that's true if you play one game. Looking over this driver, I see increases in multiple games. Imagine that. Common API. Multiple games. Many games. Not one game. Mind blown.
While some of the increases aren't incredible, some of them are fairly high. Some games are showing pretty sizable increases. I'll take it, like I said, sounds good to me. But if some fans of the other side want to poo poo on that fact, I don't quite get it. The 7970 had a pretty awful driver situation at launch and later released their performance driver for multiple games. That happened something like..6 months after? If I recall. It's just free performance, even if it doesn't increase every game by 20%. Clearly anyone expecting 20-30% jumps in every game had improper expectations. I do look forward to seeing what DX12 can do, hopefully we will get some beta form near the end of this year. In the meantime, AMD will have plenty of time to do their thing with Mantle. Which is fine by me.