whats the best thing i can do with my NVIDIA GTS 250s? (Sensible answers please

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that's still a great card vor watching movies and porn.
or use his miner that STILL works before he dropped support for your card ?
Or perhaps it's just that card doesn't support compute 3.0, thus nvidia doesn't support his card.

You could make the argument that older cards could be supported, but realistically all developers need to draw a line as to what hardware will be supported so that they can continue to work on the latest and greatest. Their time is best spent working on thinking forward, rather than working backwards. I know I have a couple 8800s laying around someplace, but I don't expect them to be supported by anything really.