Of
course, this could have really screwed up the HD 4830 launch for AMD
since the missing shaders account for about a 10% drop in performance
according to the testing performed.
As you can see, the FPS changes linearly with
the number of shaders in the GPU. Please note that this is data from
some real empiric testing. All those ten tests were performed with a
real running HD 4850 (running at HD 4830 clocks for better
comparability), without reboot in between, shader count was changed on
the fly.
If you look back up at the first graph, you can easily see that the AMD
4830 result matches the result I got with 560 shaders and the
PowerColor 4830 matches 640 shaders.
This test confirms that 3DMark06 Perlin is a valid test to determine
the relative shader performance of a RV770 card. It also confirms that
the register contents reflect the active number of shaders and that
AMD's sample has the shading power of a HD 4850 with 560 shaders and
that the PowerColor card is equally as fast as a HD 4850 with 640
shaders.
Source : http://www.tweaktown.com/
course, this could have really screwed up the HD 4830 launch for AMD
since the missing shaders account for about a 10% drop in performance
according to the testing performed.
As you can see, the FPS changes linearly with
the number of shaders in the GPU. Please note that this is data from
some real empiric testing. All those ten tests were performed with a
real running HD 4850 (running at HD 4830 clocks for better
comparability), without reboot in between, shader count was changed on
the fly.
If you look back up at the first graph, you can easily see that the AMD
4830 result matches the result I got with 560 shaders and the
PowerColor 4830 matches 640 shaders.
This test confirms that 3DMark06 Perlin is a valid test to determine
the relative shader performance of a RV770 card. It also confirms that
the register contents reflect the active number of shaders and that
AMD's sample has the shading power of a HD 4850 with 560 shaders and
that the PowerColor card is equally as fast as a HD 4850 with 640
shaders.
Source : http://www.tweaktown.com/
