Saddly, something in the driver makes the card eue. Only 1wu has been able to run when a gtx 200 is mixed with 8/9 cards.
I have my 8600 just suitting idle in my main box as just a physix card, because of this, plus my psu on foldie can't support 2 gpus, let alone the card fit with my 8800gt with the t-rad ands 92mm fans.
However, hope rican can get it going though.