Same issue I've been monitoring my cpu and gpu usage and heat and neither is having any problems. I've updated my drivers and it has continued.

(Copied from FFXIV system info - pruned for relevant info)
SYSTEM_OS Windows 7 Ultimate 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.110622-1506)
SYSTEM_CPU AMD Phenom(tm) II X4 960T Processor (4 CPUs), ~3.0GHz
SYSTEM_MEMORY 8191.305MB
SYSTEM_DIRECTX_VERSION DirectX 11
SYSTEM_GRAPHICS AMD Radeon HD 7900 Series
SYSTEM_GRAPHICS_VRAM 3054.184 MB
SYSTEM_GRAPHICS_SHARED_VRAM 3839.652 MB
SYSTEM_GRAPHICS_DRIVER_VERSION 8.17.0010.1191
SYSTEM_GRAPHICS_DRIVER_DATE 3/28/2013 10:37:02 PM