I found two websites that have details on my motherboard (945GZ MICRO 775 SE):
Which one should I trust? In other words, what is the maximum number of RAM I can have on my motherboard?
Intel says that I can have 4 GB of RAM.
Biostar says I can have 2 GB of RAM and "supports up to 2GB memory".
I think that Biostar is saying that I can only have a maximum of 2 GB of RAM per slot.