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I'm fairly new to mining bitcoin, but I have read that using GPU can help improve performance. I currently am using GUIMiner (latest version) running on an OpenCL back-end but when I choose to use my graphics card I get less than I would without it. I also use Slush's pool, if that could have any relation?

PC Specs: Acer Aspire 5560 AMD a6-3420M APU with Radeon HD @ 1.50 GHZ 4GB Ram, is a laptop

Also can overclocking my pc improve performance?

Thank you, - bitcoin n00b

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Using a graphics card to mine is completely fruitless, at this point you would not make a more than about 9 cents a month. Mining is now done on efficient, dedicated hardware that is designed just for this particular work. Mining on a laptop will absolutely kill it as they're not designed for continuous loads.

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