As the advice suggests - 4GB maximum. There will be a very good reason for this - either your BIOS cannot handle more than 4GB, and / or the processor that you are using (Celeron 900) is the reason. From reading the datasheet for this processor I can see that the range of integer values that the processor utilises is a 32 bit address space, which works out as 0 to 4,294,967,295. So it's the processor that you are using that will prevent you from utilising more memory. In all probability, any additional memory you add will not be seen, or even if it is seen by the BIOS it will be unused.
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