if it's a reference 9800gt cooler (Which it porbably is) then it will fit the 8800gt, they have the same mounting holes and the same chip
yes 1.3v is a lot for a stock cooler to handle unless you have an immaculate thermal paste, a crazy stock heatsink with lots of heatpipes and some modding done to the stock cooler
yes 1.3v is a lot for a stock cooler to handle unless you have an immaculate thermal paste, a crazy stock heatsink with lots of heatpipes and some modding done to the stock cooler