I have a system with an Intel motherboard - D865GBF. It is a Pentium 4 based board that I've been using for awhile (at least over a year, maybe longer). I have 1GB of RAM in it currently (2 x 512). I would like to add more memory to it. I am going to remove the memory that is in the system now and use it in another system of mine. I would like to add, at minimum, 2GB (2 x 1GB) (DDR400). I was considering, though, adding the maximum for this board which is 4GB total (there are 4 slots, so 1GB per slot). What has confused me, is in the manual for my board is the following paragraph:
System resources (such as PCI and AGP) require physical memory address locations that reduce
available memory addresses above 3 GB. This may result in less than 4 GB of memory being
available to the operating system and applications."
I just don't get it. Does this mean that if I added 4GB of ram, that I could never really use more than 3GB? I'm confused. Why would they say the board supports up to 4GB, if you really can only use 3GB? It doesn't make sense, so I think I'm not understanding this quite. I'm hoping someone here understands this better than I and can explain what exactly this means.
Thank you so much for taking the time to help.