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You are buying a dual channel RAM kit so look to see in your mainboard manual what the dual channel configrations are and read what it says carefully. I've got a similar board to you and dual channel works when the RAM pairs are in either odd or even numbered slots. I.e. 1&3, 2&4 or both at the same time. Dual channel functions are sensitive to all aspects of your RAM including capacity mixing.
I think you have two options:
1. Place the new sticks in either slots 1&3 or 2&4 and sell the other two sticks.
2. Place the new sticks in 1&2 and the old ones in 3&4.
The first option will give you dual channel but lower total capacity. Your RAM will be faster this way with a 15-20% performance increase.
The second option gives you higher capacity but lower performance. I would use this if you really need 1.5Gb.
You should know that mixing RAM speeds, capacities and timings can be dangerous for your system in dual channel configurations. You could experience instability among other things.
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