double dual channel?

Im using a neo platinum board now and i have 2 512mb sticks in that are the exact same in dual channel mode

if i add 2 more sticks that are the exact same sticks as those what will happen?

will i be running in dual channel mode with 4 sticks

or 2 dual channel mode with 2 sticks and 2sticks?

will my performance go up since im going from 1gb to 2gb

You would run dual channel, with 2 sticks per channel. Performance would be the same maybe a tad less, but first make shure its stable because there is a chance that mem controller cant handle 4 sticks.

Depends about your memory, is it double or single sided? If it's double, then you probably see only worse performance cause 4 double sided memory sticks forces your memory to run only at 333MHz, and you have overclocked your system as well, it may decrease your overclock a bit too. Again, thanks for A64's integrated memory controller.