How much RAM can my motherboard support?

ComputerWhiz305

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Jun 25, 2014
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My computer is using a Intel D945GTP motherboard.
I know it has 4 slots, but I know that some motherboards have a restriction to how much RAM they will support. I found my motherboard on cNET and it says that the max size for RAM is 4GB.
Is that a per stick number or is that for all four slots combined?