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Partial precision by itself is not cheating. By carefully tweaking the
shader programs, it is possible to achieve identical output by substituting
certain 32-bit elements of the program with 16-bit. Whether nVidia is doing
this, or degrading the output, is a whole other story.
Remember, all this is just a technicality. In Microsoft's DX9 specs, 24-bit
FPP is regarded as "full-precision". There's no such rule in OpenGL. It can
be argued that 24-bit is not enough and there are certain instances where
only 32-bit FPP can offer true visual fidelity.
On the other hand, in John Carmack's testing, "some of the ATI cards did
show a performance drop when colored mip levels were enabled, implying some
fudging of the texture filtering". Everyone's got a skeleton in his
closet...
--
"War is the continuation of politics by other means.
It can therefore be said that politics is war without
bloodshed while war is politics with bloodshed."
"Brian Dickens" <newsgroups@(remove-this-part)briandickens.demon.nl> wrote
in message news:tALMc.643$Ue.440@text.usenetserver.com...
> Geez... nVidia uses partial precision just so they can be faster than ATi.
> What a bunch of losers...
>
> =- Brian Dickens, the Netherlands
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