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Ok, first you need to understand you have two channels, A and B for your RAM. Each channel has two DIMMs: DIMM 0 and DIMM 1. If you install only one DIMM (memory sticks as you so aptly called them) then install it on channel A DIMM 0. If you wish to install two of the same DIMMs (i.e. two 512MBs 800MHz DDR3 DIMMS), install one on channel A DIMM 0 and one on channel B DIMM 0. If you wish to install a total of three DIMMs it starts to get tricky. You need have a bit of parity between your two channels. For example you need to occupy both DIMMs in channel A with the same amount and speed of RAM, as stated before. Then in DIMM 0 of channel B you need to match the total amount of RAM and speed in channel A.
DIMM 0- 512MB 800MHz DDR3
DIMM 1- 512MB 800MHz DDR3
DIMM 0- 1024MB 800MHz DDR3
DIMM 1- empty
Any additional configurations will depend on the speed and size of your RAM. Mostly it is a fair bet to use all the same RAM from the same manufacturer to get the best result. Personally I like to use the same module X2,3,4 as needed instead of mixing amounts of total memory per DIMM.
Hope this helps.