Two vs: Four Memory lane useage.

With a 32bit system we know that up to 4gb is max and the system will only recognise 3+. Is it better to install 2x2gb sticks using only two lanes or is it more effecient to use ALL four lanes with 1gb in each, using the processors two memory processing banks?
Additionaly, does 2gb outperform 4gb in a 32bit system because of not dealing with the unuseable memory out of 4gb?
Curious of your answer, I am currently using only 2x1gb and running great.
Thanks

Using a Forum is new to me and the answers make Forums worthwhile!
As I stated I have only 2gb and am running fine. One of my Friends says all four slots out performs two slots with the same amount of memory, so I did research and came up with your answers, it's better to have 2gb utilizing all vs: 4gb on a 32bit OP system and have almost 1gb as unseen (unused)memory. Theory that the unused memory is a cog in the wheel that the system is constantly trying to ulilize and can't. Your responces leave me with 2gb as the way to stay until upgrading to 64bit system, which is a good suggestion.
So since I just setup a 790FX-GD70 I am going to order 1600 (pc12800) better OC Capable memory until the decission of 64bit in Windows 7 or Vista.
Some spec. reports state up to 4gb (using 3+) on 32bit and others experss no more than 2gb for better performance. I wonder why memory mfgrs don't make 1.5gb sticks for 32bit systems? Seems that would be the best answer to utilizing ram better even though 2gb should handle everything. After all that, do many of common programs make use of "Both" processor memory banks?
Thanks for responding.

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