I am quite keen to start mining some bitcoins. I have read a lot about how the graphics card is pretty much the only important thing in GPU mining.
To what extend is this true? Can I buy a new graphics card and stick it into my old computer (roughly 500-700Mhz, 512 mb ram, etc if I remember correctly) and have it mine at roughly the same speeds, as if the same card were in a newer computer.
Will new cards even be compatible (have there been any major changes?) and do I need to worry about overheating, if I only use one gpu in this old system?
Since all my other old computers are laptops this is the only one I could use. Or would I be better off cheaply buying a computer that isn't quite as old and using that?
Any advice would be appreciated.