New graphics card

I just upgraded from a Asus EAH4770 512MB DDR5 to a Sapphire Radeon HD 5770 1GB GDDR5, my question is are they not the same type of card? so do i need to update my drivers or should my last cards drivers work fine? Because when i put my new card in my computer never detected new hardware.
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  1. I don't think it's strictly necessary but updating to the latest drivers is always a good idea.
  2. If you use a driver older than 9.12(I think),it doesn't recognize your 5770;therefore,as mentioned above,download the latest drivers.
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