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If it's got a PCI-E x16 slot then a Radeon HD4670 would be good!What can I upgraded it too with out blowing the 250w psu!!!!
also depends whats in ur system rly, if its a dual core then ye a 4000 series low card would do (4600?)
also depends on what sockets u have available.
Depends on the PSU quality really, I have an HD4890 running from my 300w Silverstone without issues.
Also, check with "office PCs" if they need a half height card too.