引用:
Originally posted by shicha
這問題好像蠻久以前就有答案了，
http://www.gamersdepot.com/hardware...desktop/001.htm
GD: John, we've found that NVIDIA hardware seems to come to a crawl whenever Pixel Shader's are involved, namely PS 2.0..
Have you witnessed any of this while testing under the Doom3 environment?
"Yes. NV30 class hardware can run the ARB2 path that uses ARB_fragment_program, but it is very slow, which is why I have a separate NV30 back end that uses NV_fragment_program to specify most of the operations as 12 or 16 bit instead of 32 bit."
簡單說是NV用OGL 1.4的12位元或16位元精度(FX12/FP16)的渲染來取代32位元精度(FP32)，而ATI似乎是用FP24。關於ARB2，ATI跟NV都沒用，NV30用了ARB2後，效能大概只剩一半。
另外GEFORCE3屬於DOOM3官方支持的最小硬件需求...
有人用ti4200,p4 2g+512m玩過..driver還用最高質量和銳化，32bit，1024*768垂直同步"關"，doom3的影子"關"玩過，沒敵人fps為35~60fps，射擊時為15~30，一般來說，最低流暢度差不多約30fps，不過多人玩貞數最好是在60。
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@@"ATi在那次THG、Anandtech中的Doom3測試用的應該都是ARB2吧
http://www6.tomshardware.com/graphi...special_preview
http://www.anandtech.com/video/showdoc.html?i=1821&p=21
雖然沒有講得很清楚，但是Anandtech那篇有提到那時測試只有H、M、L Quality可以選，
照預設的話R3x0用的應該是ARB2；
不過John大神也說過R300+R200-path 和R300+ARB2的速度差異很小http://www.beyond3d.com/interviews/jcnv30r300/index.php?p=2
http://www.hardwareaccelerated.com/...topic.php?t=158
反正大神對NV30 on NV30 path的畫質可以接受，
我看也沒必要硬要NV3x跑ARB2…有點自廢武功的感覺@@"
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話說回來，R200 path沒有用到FP吧，用到FP24應該就是ARB2了@@"