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The three p2pool networks are intended to be for different size miners: 1st network (port 9171) is for big miners 2+ Mh/s, 2nd network (port 9172) is for medium miners 1-2 Mh/s, and third network (port 9174) is for small miners < 1 Mh/s...
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are hashrates for total rig power? say if I have two rigs 800 kH/s each, which network should I stick?