It is pointless to overclock such a high-performance graphics card unless you want to set some new records, especially as running a Radeon HD 7990 at increased clock rates means taking the risk of damaging it because of overheat. Anyway, we checked out its overclocking potential by increasing the frequencies to their limits in the EVGA Precision utility. The Power target had been stepped up by 20%.
Our AMD Radeon HD 7990 was stable in all our tests at 1100/6300 MHz.
We only tested the overclocked card in an open computer case at the maximum speed of the fans, just to be on the safe side. That’s why its temperature was more or less normal:
We measured the power consumption of our testbed equipped with different graphics cards using a multifunctional Zalman ZM-MFC3 panel which can report how much power a computer (without the monitor) draws from a wall outlet. There were two test modes: 2D (editing documents in Microsoft Word or web surfing) and 3D. In the latter case the load was created by four runs of the introductory “Swamp” scene in Crysis 3 game at 2560x1440 with maximum image quality settings, but without MSAA.
Besides the other two premium-class products, we will compare the AMD Radeon HD 7990 against the HIS 7970 IceQ X² GHz Edition in this test:
The AMD Radeon HD 7990 configuration is quite voracious, requiring 195 watts more power than the HIS 7970 IceQ X² GHz Edition. It is in fact the least economical graphics card. It needs 84 watts more than the GeForce GTX 680 and 151 watts more than the GeForce GTX Titan. Notwithstanding AMD’s claims that the Radeon HD 7990 is economical in 2D applications, its power consumption is much higher in this case in comparison with the other graphics cards in this test session.