Upgrading very old system

sonix32

Distinguished
May 17, 2011
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I need your advice regardless upgrade of my sister's old computer.

System:

Mobo: gigabyte GA-K8N51GMF-9 (rev. 1.0)
Cpu: AMD athlon 64 3200+ Mhz single core
Gpu: ATI HD 4850
Ram: 1 Gb (2x512Mb)
Power supply: LC power 450 w
Medium size case
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I am thinking of upgrading that system to get solid computer for everyday use but with minumin money spended.
Any ideas?