The DS3R is listed on some competitors' sites as supporting Crossfire, but mine only came with 1 x16 PCI-E port, so if you need a specific feature it's best to check Gigabyte's site rather than rely on the e-tailers' information!
Also, bear in mind that there's different revisions and some things do change according to which one you get (though I doubt it'll be something as major as RAID being added, might be simply a different audio chipset or something), and that there's optional peripherals (like little brackets that go in expansion slots that have extra USB or firewire ports etc.) that some etailers might include and others not.
AFAIK, only the DS3L doesn't have RAID.