Official HD 2900 Discussion Thread

[Tim]

Thank you very much for taking the time to explain it, I did understand that more or less, but....am I right in saying that whatever makes the card choose the vertex/pixel shaders on the fly in a DX10 game is the most crucial bit....is it called a scheduler? If that sucks, then it could very well mean that the R600 could beat the G80 right? Or vice versa.

Thanks again, I try to read up on stuff like that, but most explanations still go way over my head unfortunately. I'm more of a gamer.

[alexio]

Thank you very much for taking the time to explain it, I did understand that more or less, but....am I right in saying that whatever makes the card choose the vertex/pixel shaders on the fly in a DX10 game is the most crucial bit....is it called a scheduler? If that sucks, then it could very well mean that the R600 could beat the G80 right? Or vice versa.

Yes, the scheduler is important. In the G80 it runs at half the shader clock, so there are latencies involved here. The scheduler assigns a thread to a streaming processor. Of course it's more efficient to have the scheduler run at the same clock as stream processors. I'm not sure how big the difference is though. If the scheduler can assigns two thread to one processor then the penalty is rather small. I don't know enough about the G80 architecture to tell you about the latencies involved.

I have no information at all regarding the scheduler of the R600 to tell you how it is compared to the one in the G80. The architectures are so complex and different from each other that from specs alone it's hard to pick the better one. Only benches will tell the truth after both companies have had time to optimize for DX10 (and ATI for DX9).

[Tim]

Yes, the scheduler is important. In the G80 it runs at half the shader clock, so there are latencies involved here. The scheduler assigns a thread to a streaming processor. Of course it's more efficient to have the scheduler run at the same clock as stream processors. I'm not sure how big the difference is though. If the scheduler can assigns two thread to one processor then the penalty is rather small. I don't know enough about the G80 architecture to tell you about the latencies involved.

I have no information at all regarding the scheduler of the R600 to tell you how it is compared to the one in the G80. The architectures are so complex and different from each other that from specs alone it's hard to pick the better one. Only benches will tell the truth after both companies have had time to optimize for DX10 (and ATI for DX9).

Dankjewel for the uitleg. (Thanks for the explanation)

Much appreciated...I guess we'll just have to wait and see.

[alexio]

Dankjewel for the uitleg. (Thanks for the explanation)

Much appreciated...I guess we'll just have to wait and see.

Graag gedaan = no problem

[Noobie]

Yes, the scheduler is important. In the G80 it runs at half the shader clock, so there are latencies involved here. The scheduler assigns a thread to a streaming processor. Of course it's more efficient to have the scheduler run at the same clock as stream processors. I'm not sure how big the difference is though. If the scheduler can assigns two thread to one processor then the penalty is rather small. I don't know enough about the G80 architecture to tell you about the latencies involved.

I have no information at all regarding the scheduler of the R600 to tell you how it is compared to the one in the G80. The architectures are so complex and different from each other that from specs alone it's hard to pick the better one. Only benches will tell the truth after both companies have had time to optimize for DX10 (and ATI for DX9).

From http://www.elitebastards.com/cms/ind...1&limitstart=2 :

We've already mentioned the scheduler present alongside every cluster of sixteen Stream Processors - As well as this there is also a global scheduler present in G80, which oversees the graphics core as a whole.

[fornowagain]

Review, found by Topgear

http://extremeoverclock.org/his-hd-2....html#more-307