my system doesnt see the ram i installed,(512x2) its perfectly compatible,still it only sees 448 MB out of 1024?

It looks like your computer is seeing only one 512Mb RAM module. Your computer uses shared RAM - 448Mb RAM is available for the computer and 64Mb is reserved for video RAM (448 + 64 = 512Mb) of RAM.
One of the RAM modules may be faulty. To determine which RAM module is faulty, remove both RAM modules and insert one RAM module at a time to determine the faulty RAM module.
If both RAM modules are OK then -
Some computers do not like mixed RAM modules from different manufacturers. Try using the RAM modules with the same make and type/speed.

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