PrimeGrid's Challenge series ends 2010 with the Winter Solstice Challenge. Please come join us in observing Nature's ending/beginning of a cycle...a Winter Festival on PrimeGrid's only GPU accessible project. A 3 day (18-21 Dec) Challenge is being offered on PPS (Sieve). 32&64 bit builds are available for Mac, Linux, and Windows as well as CUDA/ATI (OpenCL) for the GPU. For more information, please see this forum thread.

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