info on ATI graphics processor for Xbox 2

R

R420

_______________________________________________________________________________
The Xenon GPU is a custom 500+ MHz graphics processor from ATI. The
shader core has 48 Arithmetic Logic Units (ALUs) that can execute 64
simultaneous threads on groups of 64 vertices or pixels. ALUs are
automatically and dynamically assigned to either pixel or vertex
processing depending on load. The ALUs can each perform one vector and
one scalar operation per clock cycle, for a total of 96 shader
operations per clock cycle. Texture loads can be done in parallel to
ALU operations. At peak performance, the GPU can issue 48 billion
shader operations per second.

The GPU has a peak pixel fill rate of 4+ gigapixels/sec (16
gigasamples/sec with 4× antialiasing). The peak vertex rate is 500+
million vertices/sec. The peak triangle rate is 500+ million
triangles/sec. The interesting point about all of these values is that
they're not just theoretical—they are attainable with nontrivial
shaders.

Xenon is designed for high-definition output. Included directly on the
GPU die is 10+ MB of fast embedded dynamic RAM (EDRAM). A 720p frame
buffer fits very nicely here. Larger frame buffers are also possible
because of hardware-accelerated partitioning and predicated rendering
that has little cost other than additional vertex processing. Along
with the extremely fast EDRAM, the GPU also includes hardware
instructions for alpha blending, z-test, and antialiasing.

The Xenon graphics architecture is a unique design that implements a
superset of Direct3D version 9.0. It includes a number of important
extensions, including additional compressed texture formats and a
flexible tessellation engine. Xenon not only supports high-level
shading language (HLSL) model 3.0 for vertex and pixel shaders but
also includes advanced shader features well beyond model 3.0. For
instance, shaders use 32-bit IEEE floating-point math throughout.
Vertex shaders can fetch from textures, and pixel shaders can fetch
from vertex streams. Xenon shaders also have the unique ability to
directly access main memory, allowing techniques that have never
before been possible.
_______________________________________________________________________________


can be found at the following links:

http://www.rage3d.com
http://forums.xbox-scene.com/index.php?showtopic=231928
http://www.beyond3d.com/forum/viewtopic.php?t=13470



I don't know what to make of this. While in some ways, the Xbox 2 GPU
is way ahead of the current Radeon X800 XT. like having 48 ALUs. I
think the X800 XT has only 22 (16 pixel pipes + 6 vertex shaders). As
well as Xbox 2 GPU on-chip eDRAM for framebuffer and z-buffer. plus
Shader Model 3.0++. no available ATI PC GPU has that stuff, yet. but
in other areas, the Xbox 2 GPU seems to be less than the Radeon X800
XT.

in fillrate:
X800 XT - 6.4 gigapixels/sec
Xbox 2 GPU - 4+ gigapixels/sec

in vertex/geometry performance:
X800 - 600 million vertices/sec
Xbox 2 GPU - 500 million vertices/sec

Obviously the Xbox 2 GPU specs are suspect. they're unconfirmed. could
be old or even completely fake. but assuming they are true, it gives
you something to chew on.
 
B

Bagpuss

On 24 Jun 2004 11:51:46 -0700, (e-mail address removed) (R420) wrote:

Obviously the Xbox 2 GPU specs are suspect. they're unconfirmed. could
be old or even completely fake. but assuming they are true, it gives
you something to chew on.

Oh FFS its not bad enough that you are just plagarising other
webshites, you now resort to re-posting sections of already articles
as new posts.

You really are a class interpikey.

The specs BTW are just best guesses. If you are going to try and put
some comment there (well done for at least trying for once) put
something actually worth the effort rhater than just, it may be fake
it may be genuine it makes you sound like all the other 15 year old
"web journalists". Put a little effort in please.
 
H

HedCase (Jim Campey)

You really are a class interpikey.

I thin "interpikey" should be added to the next OED :)

--
Jim
(Remove no spam to reply)

Gamertag: HedCase

We were unanimous - in fact everyone was unanimous.
 
B

Bagpuss

I thin "interpikey" should be added to the next OED :)

Heh,

Interpikey :- Noun , someone who spends their life looking for free
stuff on the net, preferably illegal and plagarising other web sites
for self promotion.
 
R

R420

Bagpuss said:
On 24 Jun 2004 11:51:46 -0700, (e-mail address removed) (R420) wrote:


Oh FFS its not bad enough that you are

<snip>

do I get points for being on-topic? :)
 
B

Bagpuss

<snip>

do I get points for being on-topic? :)

No, alt.comp.periphs is not really a proper Xbox 2 group, nor
sys.ibm.pc.harware.

1/2 out of 10 for effort. Still its a step forwards :)
 

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