Technical data / specifications

The XFX R7970 Double Dissipation is a Radeon HD 7970 graphics card, which is based partially on AMDs reference design. That part that has been entirely built according to AMDs specifications concerns the PCB. There nothin has been touched by XFX. What XFX did themselves, that's the cooler. They decided to make use of a model that is more silent when the fans are at full speed. Like this they gave away some of the overclocking potential of this card. Overall we think this is a good descision because most of the users wont overclocker their GPU and they like it when a component is as silent as possible.

A closer look at the clock speeds reveals that they're no different from the reference clock. The GPU operates at 925 MHz and the memory at 2'750 MHz (effective 5'500 MHz). Furthermore there is a total of 3'072 Megabyte of GDDR5 memory that is connected to the GPU via a 384 Bit memory interface. Therefore the card offers 264'000 Megabyte per second of memory bandwidth.

The GPU itself consists of 4.31 billion transistors and it is being manufactured at TSMC using their latest 28 nanometer process technology. The Radeon HD 7970 is AMDs flagship model which is why it comes with all features activated. This card offers 32 compute units, which means that there are 128 TMUs, 128 TAUs and 32 ROPs. Overall there are 2'048 shader units.

	Radeon HD 7970	Radeon HD 7950	Radeon HD 6970	Radeon HD 6950	GeForce GTX 580
Chip	Tahiti	Tahiti	Cayman XT	Cayman Pro	Cypress XT
Process	28 nm	28 nm	40 nm	40 nm	40 nm
Transistors	4.31 billion	4.31 billion	2.64 billion	2.64 billion	3.00 billion
GPU clock	925 MHz	800 MHz	880 MHz	800 MHz	772 MHz
Shader clock	925 MHz	800 MHz	880 MHz	80 MHz	1'544 MHz
Memory	3'072 MB GDDR5	3'072 MB GDDR5	2'048 MB GDDR5	2'048 MB GDDR5	1'536 MB GDDR5
Memory clock	2'750 MHz	2'500 MHz	1'375 MHz	1'250 MHz	2'004 MHz
Memory interface	384 Bit	384 Bit	256 Bit	256 Bit	384 Bit
Memory bandwidth	264'000 MB/s	240'000 MB/s	176'000 MB/s	160'000 MB/s	192'384 MB/s
TMUs	128	2x 96	96	88	64
TAUs	128	2x 96	96	88	64
Shader Cores	2'048 (1D)	1'792 (1D)	384 (4D)	352 (4D)	512 (5D)
ROPs	32 ROP	32 ROP	32 ROP	32 ROP	48 ROP
Shader model	SM 5.1	SM 5.1	SM 5	SM 5	SM 5
Maximum board power	250 Watt	200 Watt	250 Watt	200 Watt	244 Watt

Page 1 - Introduction	Page 8 - Stone Giant
Page 2 - Technical Data / Specifications	Page 9 - World in Conflict
Page 3 - Preview / Delivery	Page 10 - Resident Evil 5
Page 4 - Testing conditions	Page 11 - Call of Juarez
Page 5 - 3D Mark 11	Page 12 - Far Cry 2
Page 6 - 3D Mark Vantage	Page 13 - Overclocking
Page 7 - Unigine Heaven	Page 14 - Conclusion

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