I have a Nvidia 540 M ( dell xps 502 ) and this is only getting 14 mh/z mining rate.
How much MH/z would you get by a 100 USD Ati Card ( I read Ati cards are better ) ?
How much mh/z you need presently to mine 1 Bitcoin in 1 day ( or a week, etc ) ?
In what time is expected that the required effort to mine 1 Bitcoin doubles ? I.e at what rate gets harder to mine ?
How much % of bitcoins are already mined ?
Sorry guys, know this all is answered, just doing 100 things at once, and also researching on my own.
The only way to dive into BTC mining is to purchase an ASIC (Avalon or BFL). I would suggest considering mining Litecoin instead. I posted a few things I've learned in my short time here on the following thread about building a Litecoin rig. Litecoin will still be GPU viable until an ASIC is made for that market. And the earlier you get in on Litecoin, the better - at least that's my opinion - because I believe the BTC miners who don't switch to ASICs, will repoint their rigs at LTC (completely unfounded speculation, but that's my thought).