What is your Mining Hash rate?


#41

AMD cards are probably a bad example since they are decent at Ethash but horrible at Keccak…


#42

For fun, I am mining on a 1GB Radeon HD 7750 here and while not really getting a lot out of it, it is certainly possible and gives me a hashrate of around 70MH/s. This only makes sense because the card draws a meager 40W. The GTX 640 will probably be around the same neighborhood. These cards, while operable, are really too weak to make any serious dents.


#43

Are you sure you set up the card correctly? I am running a GTX 970 and I’m getting twice that hashrate.
Make sure to enable GPU processing in the card’s setting using nVidia’s software.