Upgrading RAM on MacBook Pro 13" to 1 Slot of 4Gb RAM

Please help,
I want to upgrade my MacBook Pro's RAM. Currently I have 2Gb of RAM, one 1Gb on the top slot and another one 1Gb in the bottom slot. I want to upgrade to 4Gb of RAM so that I only use one 4Gb on the top slot.
TechSpecs:
Model Name: MacBook Pro
Model Identifier: MacBookPro5,5
Processor Name: Intel Core 2 Duo
Processor Speed: 2.26 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 2 GB
Bus Speed: 1.07 GHz
Boot ROM Version: MBP55.00AC.B03

I thought if I was only going to use 1 module, I should put it in the bottom slot.
It doesn't matter which slot you put it in. If you put it in the bottom slot, you won't have to remove it first if you decide to add a second one later. But why on earth would you choose not to use both slots now, when you have modules to put in both? 5GB of RAM is better than 4GB.

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