Can I upgrade my HP pavilion desktop graphic card to AMD Radeon 7870 2gb?

Hey recently I have decided I wish to upgrade my HP pavillions desktop graphic card to an AMD Radeon 7870 2gb, I will put the Product Number, Model Number and Serial Number below.

I understand I will have to ugprade my Power Supply Unit but I am unsure on what will fit. I would be very grateful If I could get help on what I am doing here. The link of the card which I wish to buy is:

http://www.amazon.co.uk/VTX3D-Radeon-7870-Tahiti-Graphics/dp/B00AM3A7JY/ref=sr_1_3?s=computers&ie=UTF8&qid=1401819077&sr=1-3&keywords=amd+radeon+7870

It has the correct number of slots although has to extra ports which are not needed. I am just wondering will this work?

Thanks

Here are the Product Number, Model Number and Serial Number.

My Product Number is D7U83EA#ABU

My Model Number is 500-152ea