I don't know what Blender is...
@rohcQaH: Thanks for your answers. My box runs pretty cool so I am sure I can handle a graphics card like the HD4650 or HD4670. The reason I replaced all my coolers with bigger Zalman fans and heatsinks isn't because of heat but because of noise. Bigger fans can usually rotate slower and still provide the same amount of airflow :-)
IMHO the most noisy parts of a computer are the small cheap plastic fans. They tend to rattle after a while. The noisiest cricket I had was the tiny northbridge fan so I replaced it with a heatsink. Now the noisiest thing is the small fan cooling my Nvidia 6600GT.
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