You can upgrade upto 16GB with 0MB non-removable base memory and 4 memory slots
Machine name: Sony VAIO VGN-Z899GAB
CPU options: Intel Core 2 Duo (2.53GHz) Processor
Chipset: Intel GM45 Chipset
HD Bus: SATA 2.5"
Front Side Bus options:
Memory Speed options: PC3-8500 DDR3-1066 204pin SDRAM SODIMM
Special notes: Maximum configurations require a 64-bit operating system.