HP Pavilion p7-1154 GPU upgrade

Hello i have a HP Pavilion p7-1154 and i am looking to upgrading my gpu. I am not sure what GPU will be compatible and whether or not they will be any bottle necking. I looking to installing a nvidia gts 450 from my friends alien ware PC as he just recently upgraded but im not sure whether it will work with me PC.
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More about pavilion 1154 upgrade
  1. it will work only if your pc's power supply has a 6 pin pcie connector for the graphics card. if it doesnt it wont work. in that case you have two options. option no 1 is to upgrade your power supply and keep the gts 450 or option no 2 keep the power supply and get a 7750 amd radeon which does not require any connectors and also its more powerful and consumes less power than 450
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