Is it normal for my card to be mining at a max of around 23Mh/s?
I understand that for nvidia cards, I should be using a cuda miner. However, all miners I have tried, poclbm, bfgminer and rpcminer-cuda all hit around 23Mh/s.
I have also tried running rpcminer-cuda with -gputhreads 384(384 from
here, I have a GT 640 128-bit DDR3), but it does not change anything.