Here we are...You are corrent with your max 512MB hypothesis
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Memory Upgrade for Dell Inspiron 8000 Laptops
Memory Specifications
Standard Memory 64 MB (removable)
Maximum Memory 512 MB
Memory Expansion 2 sockets
Memory Comments PC100 SDRAM SODIMMs.
CPU Type Intel Mobile Pentium III
Model Comments 100MHz FSB, Intel 815e AGPSet Chipset
Memory Upgrade for Dell Inspiron 8000, the Dell Inspiron 8000 takes the PC100 SDRAM SODIMMs. Memory Type, and comes installed with 64 MB (removable) of Memory. You can upgrade your Dell Inspiron 8000 to up to a maximum of 512 MB Memory, the system has 2 sockets to install Memory, already with 64 MB (removable) standard Memory installed. For best system performance use the maximum amount of allowed Memory per slot for your system.
So that means the most you can have is 256+256...but so far I have not seen anywhere that says it will take a 512 card...