Repost from OT
Damn, I should have included that in my search.
just how is nvidia "leaps and bounds" over ATI?
Well, considering the Radeon 8500 barely squeaks past the GF3 500 with its new drivers and can't stand up to the GF4, I'd say Nvidia is at least a small "leap or bound" ahead of ATI. Not to mention the rate at which Nvidia seems to update their product lineup. I think the phrase "blisteringly fast" comes to mind.
As far as John Carmacks opinion on the GF4, he was mainly referring to the deficiencies of the GF4MX which is utterly worthless IMO. Here is a snippet:
"Nvidia has really made a mess of the naming conventions here. I always
thought it was bad enough that GF2 was just a speed bumped GF1, while GF3 had
significant architectural improvements over GF2. I expected GF4 to be the
speed bumped GF3, but calling the NV17 GF4-MX really sucks."
Here is a
link to the interview Carmack gave the upcoming Doom title and the GF4/Radeo 8500.
He points out that the ATI card has the ability to render a texture on a single pass instead of two or three passes on the GF4 due to its superior fragment level processing.
"The fragment level processing is clearly way better on the 8500 than on the
Nvidia products, including the latest GF4. You have six individual textures,
but you can access the textures twice, giving up to eleven possible texture
accesses in a single pass, and the dependent texture operation is much more
sensible. This wound up being a perfect fit for Doom, because the standard
path could be implemented with six unique textures, but required one texture
(a normalization cube map) to be accessed twice. The vast majority of Doom
light / surface interaction rendering will be a single pass on the 8500, in
contrast to two or three passes, depending on the number of color components
in a light, for GF3/GF4."
This last paragraph indicates to me that while this may be great for Doom, it may not translate as well to other titles. Carmack's later statement strengthens my belief on this:
"I can set up scenes and parameters where either card can win, but I think that
current Nvidia cards are still a somewhat safer bet for consistent performance
and quality."