i have 512mb in one slot can i use 1gb on second slot

my mobo is i945gz currently i am using 512mb in one slot another is blank , can iuse 1gbram on second slot tolal ram will be 1.5gb. is it possible?
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  1. Best answer
    From Asrock's website: Memory - Dual Channel DDRII memory technology - 2 x DDRII DIMM slots - Supports DDRII533 - Max. capacity: 2GB

    So, yes.
  2. If you try put the 1GB in the lead slot closest to the CPU
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