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Umm............ well actually the R8500 is more powerful than the R9000 Pro, atleast in scenes with more complex polygons.
The 8500 Pro has 4 pipes, and 2 TMU's per pipe, whereas the 9000 has 4 pipes, but only 1 TMU. Now, the 8500 has 2, less powerful (PS1.1) shaders, whereas the 9000 Pro has 1, powerful (PS1.4) shader, borrowed from the R9700 Pro. In general the shading performance is a wash, but the 8500 beats the 9000 pro in almost everything.
The Ti4200 beats them both, and the 9600 beats that.
And PC2100 sucks.
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