320mhash is pretty fast, what GPU are you using? I only got 70mhash out of my 4850. I wouldn't consider anything faster to be spare scrap.
edit: 6950 I see. That's a $400 video card, and you're not using it for anything else? You'd have to be pretty lucky to make that back, let alone other hardware costs and power.
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Broke my addiction! Bye bye
Eve, hello Minecraft. Wait... >_<