Hello everyone. I am experiencing the exact same issue that Capella is talking about. Using the following setup I receive what can only be perceived as no noticeable difference with one card or two.

Here's all the info:
CPU - Intel Core i7 930 2,8GHz Socket 1366
RAM - Kingston HyperX DDR3 PC12800/1600MHz CL9 (a total of 12GB in 2GB sticks)
GPU - 2x Gigabyte Radeon HD5770 UD HDMI DisplayPort Dual-DVI 1GB (setup in CF-mode)
DVD - Sony Optiarc AD-5240S
USB - D-Link Bluetooth 2.1 USB Adapter 25m
HSF - Scythe Mugen II Rev. B
HDD - Samsung SpinPoint F3 HD103SJ 32MB 1TB
PSU - Cooler Master Silent Pro Gold 800W

Fresh Win7-64bit install.
Latest Catalyst drivers. (and Catalyst Control Centre also report CrossFire as being enabled)
Fresh FFXIV install.

Also note that: Portal 2 (runs AWESOME at max settings), StarCraft II (runs AMAZING at max settings)

Using normal settings in fullscreen mode. FFXIV preforms like CRAP on this rig. So, what gives? Is there some sort of magic trick I have to preform in order to get this to work?

Feel free to chip in with any advice that you think might help the situation.

Thank you.

/Gasher