I just bought a new computer Gateway SX2370 http://support.gateway.com/s/desktop/2011/gateway/sx/2370/sx2370sp2.shtml The computer came with AMD Radeon HD 6550D Graphics. The back of the computer has a VGA port and a HDMI port.

Before I buy SAPPHIRE HD6670 PCI Express Video card, I want to know if the following setup works or not. If I add a SAPPHIRE HD6670 card to the computer, will I be able to setup dual monitor (one monitor plug to the original VGA/HDMI port and a second monitor plug to the SAPPHIRE card), thus doubling my desktop space. Do I have to do anything in computer BIOS to enable both graphics (the build-in Radeon HD 6550D and the add-on SAPPHIRE HD 6670 card)?