Ok, Andy did some tests and here are his numbers: GeForce 6200 AGP 256MB: quake3: 1346 frames, 7.0 seconds, 192.8 fps glxgears: 1360.8 fps
Sapphire Atlantis 7000 PCI 64MB DDR: quake3: 1346 frames, 43.4 seconds, 31 fps glxgears: 343.584 fps Radeon 9000 PCI 64MB: quake3: 1346 frames, 85.1 seconds, 15.8 fps glxgears: 413.6 fps The GeForce and 7000 numbers look usable for us, but there's something wrong with the 9000. Andy found all sorts of misrendering with the 9000. If anyone would like to take a look at the glxinfo for the 9000, perhaps we can fix that. We want to make a projection for OGD1. To do that, we need to compare the various limiting factors. They are: - Memory bandwidth - PCI bandwidth - Pixel pipes - GPU clock There are numerous other factors, but I think these are probably the dominant ones. To begin with, there's PCI. That's going to be a major choke point, and we have to determine its effects. That means we either need to try another PCI card (with faster GPU) or a Radeon 7000 AGP card. Or we can try another GPU entirely, one on PCI, the other on AGP/PCIe. Here's how we stack up to the 7000 (us vs. them): Pixel pipes: 2 vs 1 Usable memory throughput: 1350 vs 430 GPU clock: 150-200 vs 150 Depending on whether it's GPU choked or memory choked, we can move anywhere between 2 to 3.5 times as many pixels per second. If that's all there is to it, we can say that OGA (on OGD1) would push at least 60fps for Quake III. However, if the PCI bus is the problem, we'll only beat the 7000 if our DMA packets require fewer words for the same number of triangles. I don't know how small the glxgears triangles are, but if they're not TOO small, we could double the 7000's performance, so we'd push about 680 fps. _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
