Any know how?

[extreme]

Does anyone know how to mount a slk-800 on a 9800 pro?

[12am]

Presuming you actually could I don't think that would be a wise idea seeing how heavy the slk800 is, much less with a fan attached to it. I think that if you managed to even attach it somehow that the weight would put too much strain on the card and or your agp slot causing damage to one or both.

[extreme]

I have see some people do it. I have a dead 9800 pro and 2 slk-800's and a dead mobo. Maybe i can test the weight by just putting it on the card and putting the card in the mobo.

[12am]

I would test that first. The only way I see you mounting the heatsink on the vid card is by placing the heatsink on the gpu, marking where the mounting holes meet the heatsink and then drilling through the heatsink, and then using a long bolt and some plastic nuts to secure the heatsink to the gpu. Good luck.