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OK to sand-remove TIM from geforce GPU?

I started to use a super super fine sandpaper to sand off the thermal material from my video card to replace the dying fan and heatsink. I noticed that there is copper underneath and so I sanded until the silver stuff was completely off and now it's bare copper. The sanding job was very clean and the GPU top is smooth as a baby's ***. Anyway, I was planning on getting rid of this card but do you think I might have killed the card? Not that I care since I have an awesome ATI RAGE IIC card installed now which has incredible 2D performance and allows superfast 3D software rendering. The reason I did this was because I couldn't stand the noise coming from this thing and I wanted to put on a quieter fan. I figured that I'd put on a larger headsink and a low rpm fan to get decent cooling. Does anyone have any suggestions? I have this huge pentium 3 fan that I could modify so it can fit on that card. Would I still need a fan if I do that?

 
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