The Sapphire HD 7970 OC Edition is the fastest, highest end video card currently available from Sapphire. This video card is outfitted with Sapphires Dual-X cooling system which includes five pure copper heat pipes extending from the GPU across the heat sink, and dual fans that are designed around quiet operation while moving a fair amount of air.
The Dual BIOS technology is designed around allowing users to choose a standard profile and a more aggressive profile with more performance. The first BIOS setting has core operating frequency set to 950MHz which is an increase of 25MHz from the reference design, and the memory's operating frequency set to 1425MHz which is an increase of 50MHz. The second BIOS profile has core operating frequency set to 1000MHz on the core which is an increase of 75MHz compared to the reference HD 7970 design, and 1450MHz on the memory which is a 75MHz increase.
The Dual-X cooling system is what we as enthusiasts expect a company to bring to the table on its high end video cards. The Sapphire HD 7970 OC Edition has two fans that have a shiny gloss on them to help fight wind resistance. This allows them to operate at faster speeds without the excess noise. These fans cool the custom heat sink that is elevated above the PCB. The five pure copper heat pipes spread heat evenly across the heatsink. The Dual-X cooling system should result in some impressively low temperatures.
The first thing we do when overclocking an AMD based video card is to turn PowerTune up to 20%. We found the maximum core clock speed without voltage tweaking was 1150MHz. This is an increase of 200MHz from the Sapphire HD 7970 OC Edition's default setting. We were also able to increase the memory up to an impressive 1860MHz. Compared to the stock settings, this is an increase of 435MHz.
We also managed an impressive 1860MHz on the memory which is an increase of 435MHz. After increasing voltages by 188mV we were able to increase the cores frequency by an additional 130MHz up to 1280MHz. The memory would not increase anymore past 1860MHz. BTW the fans were set to 70% for this overclock.
The Sapphire HD 7970 Oc graphics card out-of-the-box is more power efficient than a standard reference Radeon HD 7970. Sapphire has improved on power efficiency, even though it is running at higher clock speeds.
Source
The Dual BIOS technology is designed around allowing users to choose a standard profile and a more aggressive profile with more performance. The first BIOS setting has core operating frequency set to 950MHz which is an increase of 25MHz from the reference design, and the memory's operating frequency set to 1425MHz which is an increase of 50MHz. The second BIOS profile has core operating frequency set to 1000MHz on the core which is an increase of 75MHz compared to the reference HD 7970 design, and 1450MHz on the memory which is a 75MHz increase.
The Dual-X cooling system is what we as enthusiasts expect a company to bring to the table on its high end video cards. The Sapphire HD 7970 OC Edition has two fans that have a shiny gloss on them to help fight wind resistance. This allows them to operate at faster speeds without the excess noise. These fans cool the custom heat sink that is elevated above the PCB. The five pure copper heat pipes spread heat evenly across the heatsink. The Dual-X cooling system should result in some impressively low temperatures.
The first thing we do when overclocking an AMD based video card is to turn PowerTune up to 20%. We found the maximum core clock speed without voltage tweaking was 1150MHz. This is an increase of 200MHz from the Sapphire HD 7970 OC Edition's default setting. We were also able to increase the memory up to an impressive 1860MHz. Compared to the stock settings, this is an increase of 435MHz.
We also managed an impressive 1860MHz on the memory which is an increase of 435MHz. After increasing voltages by 188mV we were able to increase the cores frequency by an additional 130MHz up to 1280MHz. The memory would not increase anymore past 1860MHz. BTW the fans were set to 70% for this overclock.
The Sapphire HD 7970 Oc graphics card out-of-the-box is more power efficient than a standard reference Radeon HD 7970. Sapphire has improved on power efficiency, even though it is running at higher clock speeds.
Source
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