Bryce files are mostly number crunching as I understand it. That's not a function of the video, its a function of the math processor in your chip. What you see is not what's happening inside. The image sizes are only a few k, maybe a few megs if you render at large format. So, that should tell you that the real work is not being done on the video card, but in the processor chip/ram. Bryce is ahead of its time. Maybe some day AMD will come out with a 20ghz/640bit chip that accesses a strait pipe to some 4xDDR 666 ram and then we can render faster. Until then, find ways of reducing render time. Reducing bump height when its not needed, using a simple color with transparency instead of water textures when you can, reducing specularity/refraction/reflection where you can, avoiding volumetrics when you can, etc. Use the resource hogs only when necessary.