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Compaq Presario C551NR Memory

System Memory
Standard Memory: 512 MB (removable)
Maximum Memory: 2.0 GB
Expansion Sockets: 2 sockets
Memory Comments: PC2-4200 DDR2 SDRAM SODIMMs.
System Specifications
Processor: 1.86GHz Intel Celeron M 440
Model Comments: 533MHz FSB
These memory upgrades are all guaranteed to work with
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