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Politics : Formerly About Advanced Micro Devices
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To: Patrick Grinsell who wrote (41020)11/8/1998 1:09:00 AM
From: Ali Chen  Read Replies (1) of 1574060
 
Patrick, re <bandwidth and bottlenecks>
The article you cited is a dilettante's
rambling. I do not know what the "fill
constrained" is, as per your reference
to some Intel guy.
The 3-D pipeline usually can be
1) "geometry-transform-constrained"
(mostly CPU/FPU, where 3D-Now is of
tremendous help), or
2) "triangle-setup-constrained" (where
PCI latency on writes to non-cacheable
areas are of major problem), or
3)"rendering-constrained" (where the
accelerator paints colored and textured
trianges.
The balance between these three parts
is heavily dependent on the size of triangles,
or, to be more correct, on the spectrum
of triangles for the particular scene
content. AGP has nothing to do with most
of the constraints except "rendering".
The enhancements in K6-2 Atiq Raza was
talking about are in the area of Write
Combining, which helps to combine data
directed to non-cacheable areas of video
accelerators, mostly for "triangle
set-ups". The Katmai has no visible
advantages to K6-3 (with 3DNow and 256k
on-chip L2) in any of these areas.
- Ali
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