When installing memory do you have to have an even number of cards to run parallel?

I bought a 4GB card so that would be two stock and the one I bought. 3 total. Where can I find the 'carrier' thing the actuall card slips into?
Do I have to have 4  or can I run 3? thanks for any help.

Hi there. thanks for the response. I have a 2008 and previous. below is my info. So I guess I would have to buy another card to make four? I don't remember getting any extra riser cards. I only have the two that are in there now. I have the two memory trays. the top is upside down (pic attached). I bought the memory from macmall and spoke with a rep to make sure it would work. Looks like it should but haven't tried yet.
Thanks again.
Model Name:          Mac Pro
  Model Identifier:          MacPro1,1
  Processor Name:          Dual-Core Intel Xeon
  Processor Speed:          2.66 GHz
  Number Of Processors:          2
  Total Number Of Cores:          4
  L2 Cache (per processor):          4 MB
  Memory:          1 GB
  Bus Speed:          1.33 GHz
  Boot ROM Version:          MP11.005C.B08
  SMC Version (system):          1.7f10
  Serial Number (system):          YMXXXXXXXQ2
  Hardware UUID:          00000000-0000-1000-8000-0017F2050F8E
<Message was edited by Host>

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