You guys don't get it. The average DirectX 9 game would only take under 75% load on a 5870. I've heard of examples where people have DUAL Radeon 6990's in crossfire -- that's four GPUs on one machine -- with the performance settings maxed out and with top-end custom cooling to achieve only 20% load distribution on FFXIV.
I don't think it would be fiscally feasible on Square's part to force people to buy the latest and greatest in PC hardware just to make the bloody thing run at 60FPS.
That's just retarded.