At the maximum speed of 5400 RPM the card’s roar is hard to bear, but the temperature is reduced by 18☌ at peak GPU load. The fan worked at 3200 RPM, which was very loud. Well, of course it copes, yet the GPU was almost 90☌ hot when the fan was regulated automatically. Let’s see how the reference cooler copes with the high-frequency Radeon HD 7970 GHz Edition. with its default thermal interface still intact. All thermal tests were carried out before we took the card apart, i.e. This test was performed inside a closed system case at 25☌ room temperature. We used MSI Afterburner 2.2.2 and GPU-Z 0.6.3 as monitoring tools. Predator (2010) game with the highest image quality settings in 2560×1440 resolution with 16x anisotropic filtering and MSAA 4x antialiasing). We checked out the card’s temperature during five consecutive runs of Aliens vs. The fan’s maximum power draw is 20 watts. We didn’t find any difference in the design of this cooler from the one installed on the reference HD 7970.According to our monitoring tools, the speed of the fan is varied from 1050 to 5400 RPM. This also refers to its cooling system which consists of a heatsink with a copper vapor chamber, a copper sole, a fan, and a plastic casing. Cooling SystemĪs you have learned from the previous section, the AMD Radeon HD 7970 GHz Edition is designed identically to the Radeon HD 7970. The AMD Radeon HD 7970 GHz Edition has no other differences from its non-GHz cousin. The card drops its memory frequency to 600 MHz in 2D mode. With the 384-bit bus, the memory bandwidth is a record-breaking 288 GB/s. The chips are rated for a clock rate of 6000 MHz and that’s exactly the memory frequency of the reference Radeon HD 7970 GHz Edition as opposed to the Radeon HD 7970’s 5500 MHz (+9.1%). The ASIC quality level of our GPU is very low at only 56.3%.Like on a regular Radeon HD 7970, there are 3 gigabytes of GDDR5 memory in 12 chips (Hynix H5GQ2H24AFR R0C).
In 2D applications, when the GPU clock rate is dropped to 300 MHz, the voltage was lowered to 0.949 volts. According to our monitoring tools, the GPU voltage was 1.256 volts in 3D mode. Thus, the AMD Radeon HD 7970 GHz Edition can be said to have a 13.5% higher GPU clock rate than the ordinary Radeon HD 7970. Its clock rate is increased from 925 to 1000 MHz while the new boost mode can accelerate the GPU up to 1050 MHz. The power system is managed by a CHiL Semiconductor CHL8228G controller located at the back of the PCB.Īs you may have already learned from the specs table, the GPU has no functional changes, incorporating 2048 unified shader processors, 32 raster back-ends, and 128 texture-mapping units. We could find no differences from the regular Radeon HD 7970 in terms of the PCB design and component layout, either.Like the HD 7970, this card has a 5+1 power system with five phases for the GPU and one phase for the memory chips. If you have a CrossFireX configuration, every card, save for the master, is shut down in 2D applications, which is a useful power-saving feature of the entire Radeon HD 79xx series. In 2D applications the Radeon HD 7970 GHz Edition may be as economical as 3 watts (when the monitor is turned off). Notwithstanding the increased clock rates, the new card is specified to have the same power draw as its predecessor: up to 250 watts in 3D mode. The reference Radeon HD 7970 GHz Edition looks absolutely identical to the regular HD 7970.It has the same dimensions: (278 x 100 x 38 millimeters) and the same selection of connectors including one dual-link DVI-I connector, one HDMI version 1.4a, and two DisplayPorts version 1.2.Īnd like its non-GHz cousin, the Radeon HD 7970 GHz Edition is equipped with 8- and 6-pin power connectors, two MIO connectors for building CrossFireX configurations, and a small switch to choose one of two BIOS versions.
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