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I have a Dell GX520 Optiplex model (mini tower) and upgraded the RAM from 1GB to 4GB. Although the Dell specification states

2 DIMM slots Non-ECC dual channel shared DDR2 SDRAM system memory (400 and 533Mhz) up to 2GB.

the Dell and the operating system have no problem using the whole 4GB.

How can this be happening? Are the specifications not accurate? If I was to upgrade to 8GB could it still use all of the RAM?

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up vote 2 down vote accepted

That model will take 2GB in each slot, for a total of 4GB. Check the manual.

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yeah ,you are right . i thought it's just 2G according to this link but is the specification specified the hard storage which i can upgrade to or not ? i mean ,to what extent can i upgrade the hard disk storage. and read it?? – Anyname Donotcare Oct 9 '11 at 12:00
On a relative modern SATA system: to bigger than is on the market at this time. Just make sure you do not run windows 2000 or earlier, which had ATA driver problems around 136GB. – Hennes Jul 13 at 19:36

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