The Dell Optiplex GX240 is quite aging by todays standards. It uses the Intel 845 chipset and I'm suprised that it even runs your 2.8GHz Celeron. The 845 chipset has a 400MHz FSB and normally the CPU speed is maxed out at 2.2GHz.
Here's the bad news. Your biggest bottle neck is your memory. This board uses standard SDRAM memory. To take advantage of any of todays apps and games, your really should upgrade your system to something that at least uses DDR memory.
The one thing you must relize is that any parts you throw into the Dell will possibly not work in a newer system because the difference in technology.
SDRAM memory, socket 478 CPU, AGP graphics, even the IDE hard drive, all aging technology. It would be better to start with a new updated system.
C-joe is soooo accurate! upgrading only makes fiscal sense when the machine is in its prime, once it becomes three years old or older, the cost effectiveness errodes exponentially.
get by with the machine as is; until you can build a budget for a new machine.
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