i7 930 @ 2.8GHz (stock)
Asus P6T Motherboard
6GB DDR3 RAM @ 1333MHz
Nvidia GTX 680 (stock, never OC'ed)
Drivers: 314.07 WHQL
OS: Windows 8 Pro x64
Display resolution: 1080p
Before I describe the issue, I should mention that, among other recent games, I have played through the whole of Crysis 3 (v.high w/ 4xmsaa) and Tomb Raider (ultimate preset + 2xssaa) with no issues of any sort, and got great performance as well. For the most part, MSI Afterburner showed 99% GPU utilization during gameplay. The GPU's temperature never exceeds 67C, and usually lingers in the lower 60s during gameplay.
Idle GPU temps while on the desktop are 33-34C.
Recently ran the Final Fantasy XIV: A Realm Reborn benchmark tool on the maximum preset at 1080p, and I'm seeing some strange polygon tearing on certain objects. It's like these objects have several pointed limbs extending in all directions. GPU temps are in the upper 40s to lower 50s while the benchmark is running. Strangely enough, the GPU utilization starts off at 99% but then drops as low as 35% and usually hovers between 40 and 55%.
It certainly doesn't appear to be taxing the GPU. The same benchmark runs without any issues on my friend's i7 2600K/GTX 550 Ti PC. So, what could be the issue here? Any help would be appreciated.
P.S. Ran 3Dmark 2013 as well, and no issues whatsoever there. GPU utilization was at 99% at all times during this benchmark.