VGA Calculator

[marco_simao]

Hello, i have created one tool to calculate the theoretical performance of graphics cards.
Currently i am working on the unified shader and i have some questions.

r600 is said to have 64 unified pipelines at 800mhz. They say it can do 2B vertex/s.
How is that possible, i expected more?

what is the setup engine?

What am i doing wrong, in my latest version?


Current version - 24
Beta version - 25

 

[KimB]

The number of vertices per second that a card can do isn't directly related to the number of vertex pipelines. Specifically, once those vertices are transformed, they need to go through the fixed-function triangle setup engine before entering the pixel pipelines. It's this fixed-function triangle setup engine that is likely to be the bottleneck for "vertices per second" benchmarks in unified architectures.

 

[marco_simao]

Could anyone show me the scheme of a modern gpu vertex and pixel pipelines.

 

[marco_simao]

This setup engine is limiting the vertex count the "same" way ROPs are limiting fillrate ??

Could someone give me the link about the setup engine on the xbox 360...

 

[marco_simao]

How could the setup engine performance be measured ?
Its for my calculator, i need a good answer.

 

[KimB]

Well, it's not really something that would ever be important for performance in a realistic game, so I wouldn't bother to try.

 

[Acert93]

Could someone give me the link about the setup engine on the xbox 360...

Do a search on the forum or in Google. The setup rate is 500M triangles/s (i.e. 1 vertex per clock). The vertex shaders though can do over 6B vertex transformation per second at peak (which is useless of course). But none of that tells us how this would be used in a real game.

 

[marco_simao]

Does the setup engine limit in any way the current generation and previous?

 

[marco_simao]

I have updated my latest beta. Could anyone see if is actualy acurate.
Setup engine limiter is enabled only in unified shader and must have use hacks enabled to use it.

Link is on the first post.

 

[marco_simao]

Release 25, Everything should be working fine.

Any problem, or error, please tell me!