Performace hit with 4 sticks of RAM?

[ColdFusion1990]

I want to upgrade my ram on my gaming computer from 2 GB to 4 GB. I've read that 4 GB will be a 'must' in the future, so I decided to upgrade.
Currently, I have two 1gb sticks of ram installed. So I was wondering if buying another two 1gb sticks is the right way to go, or should I buy two 2gb sticks and trash the ones I already have? (I really don't want to do the latter). This is the motherboard I have, http://www.newegg.com/Product/Product.aspx?Item=N82E16813121035
Will having four 1gb sticks be a lot worse than having two 2gb sticks on my motherboard?

 

[kimsland]

All I know is: higher Ram amount = higher wattage in one Ram slot
I usually put in 1Gig of Ram in each slot.

 

[Didou]

I'm running the same motherboard with 4 ram sticks & there hasn't any performance decrease of any kind.