i have core 2 duo with 2.9ghz processor 4gb ddr2 ram can ddr5 graphic card run on my pc ?

Your system might be able to support a DDR5 GPU but there are several characteristic your system should meet depending of the GPU you are selecting.
Could you post your system or motherboard model.
Which graphics card are you referring?
Which PSU model does your system have?

 

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