There's a new GPU-Z build available -- version 0.5.8 -- that adds improved support for Radeon HD 7970 graphics cards, including the ability to monitor voltages, improved real-time clock monitoring, and improved default clock reading (which also applies to Fusion). In addition to better handling of Radeon HD 7970 GPUs, support for which was added in version 0.5.7, the latest GPU-Z build includes a number of other tweaks that improve the overall program.
Added explanation about PCI-Express power savings and 3D render test to accurately measure bus config under load
Added function to display ASIC quality for Fermi and Southern Islands. (Located in the GPU-Z system menu; click the icon in the top left of the window)
Fixed crash on older ATI cards
Fixed OpenCL detection for AMD Antilles, Whistler, Seymour, and Blackcomb
Added support for AMD FirePro V7900, HD 6930, HD 7690M, HD 6410D
Fixed Intel Sandy Bridge IGP to be DirectX 10.1 32nm
Added support for Nvidia Tesla C2075 GeForce GT 630M
GPU-Z is a free and awesome utility that serves as a tell-all for your system's graphics processor. It reveals all kinds of vitals, such as die size, transistor count, manufacturing processor, BIOS version, and much more. You can download GPU-Z here.