what chassis is your optiplex built on? (full desktop, mini tower or small form factor?) if you have the small form factor, you're unfortunately out of luck. you can't upgrade.
kung full desktop or mini tower, have to replace the aging psu first (a new 380w coolermaster psu costs around 1.6k). the optiplex series (released mid 2002) come with either a 250 or a 300w psu. its definitely not going to be enough to power a graphics card upgrade.
also, the most decent agp gaming cards (7900gs - around 6k) require a separate 6 pin power connector which only newer psus have.
finally, a 512 stick of ddr400 ram costs around 1.3k and a stick of 1 gig ram costs around 3k.





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