I had the exact same issue but with Ubuntu, for some reason Claymore 15 doesn't work anymore with my 4GB cards. With Windows it stopped working even earlier than that. Which is a shame because I liked Claymore with the remote manager and stability and all. However Phoenix pretty much seems to do everything Claymore can, the commands might be slightly different but the features are the same.
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Thanks for repply. Sad for Claymore, i liked Claymore a lot. So, do you know the "-rxboost" equivalence in Phoenix? im lost about 4K Mhz for each card without this command on phoenix... :/ (i dont use OC)