hey there,
i´m working with a macbookpro, that´s upgraded to 4gb ram.
it´s working perfectly fine and reasonably quick as long as you don´t work with capture NX.
but for colours , i wouldn´t rely on the LED screen, cause no matter what calibration tool or programm you use, you´ll always get magenta tinted colours and it´ll always be to bright. you can turn it down , but then it´s too dark to work comfortably in other applications.
that´s why i´m working with an EIZO 24CG, which works perfectly with the built in graphicscard, cause it doesn´t has to rely on it.
that´s it for me.
cheers, zobelinski