The maximum amount of memory you can use is 768MB (3 x 256MB). It's not possible to go any higher. The reason to that is because it's using SDRAM DIMM, and SDRAM generally goes up to 256MB. So, even if you wanted to, you probably can't find any 512MB of SDRAM.
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The maximum amount of memory you can use is 768MB (3 x 256MB). It's not possible to go any higher. The reason to that is because it's using SDRAM DIMM, and SDRAM generally goes up to 256MB. So, even if you wanted to, you probably can't find any 512MB of SDRAM.