replace the video card fan with a zalman cooler? For older cards, there are the passive zm80 coolers: (i used the ZM80D-HP on a geforce fx5950 without extra fans)

http://www.zalman.co.kr/eng/product/view.asp?idx=138&code=013

For newer cards you need the ones with fans: (i use the vf700c on an asus x800xt now, together with a CNPS7700-Cu for the cpu)

http://www.zalman.co.kr/eng/product/view.asp?idx=145&code=005
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Empeg Mk1 #00177, 2.00 final, hijack 4.76