Can my computer handle an AMD Radeon HD 6850?

Hey guys,

I've tried my best but I can't seem to find whether or not my computer can run an AMD Radeon 6850. My computer is an Advent DT2111 (see here for details: http://www.pcworld.co.uk/gbuk/advent-dt2111-desktop-pc-...)

It can already use an AMD Radeon HD 6670. Info on that here: http://www.amd.com/us/products/desktop/graphics/amd-rad...

And the card I would like is the AMD Radeon 6850 which is here: http://www.amd.com/us/products/desktop/graphics/amd-rad...

I need this knowledge for a Christmas gift, so a fast reply would be excellent. Merry Christmas guys!