XPS 8300 upgradable to Saphire Radeon HD6970 2GB?

I have: SAPPHIRE 100311-2SR Radeon HD 6970 2GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity

http://www.newegg.com/Product/Product.aspx?Item=N82E16814102918

I was wondering if: http://configure.us.dell.com/dellstore/config.aspx?oc=dxcwmn1&c=us&l=en&s=dhs&cs=19&model_id=xps-8300 which is an XPS8300 dell desktop with 8GB RAM and 1TB Hard drive, could upgrade with this graphics card. Will this desktop have enough power for this card, and will it fit inside the desktop?