Radeon HD 6990 and Radeon HD 7970 - video card comparison
Passmark - benchmark score Radeon HD 6990 vs Radeon HD 7970
Radeon HD 6990
3103
Radeon HD 7970
5405
Radeon HD 6990
Radeon HD 7970
Architecture
TeraScale 3 (2010−2013)
GCN (2011−2017)
GPU code name
Antilles
Tahiti XT
Market segment
Desktop
Desktop
Release date
March 2011
December 2011
Bus support
-
PCIe 2.1 x16
Interface
PCIe 2.0 x16
PCIe 3.0 x16
Supplementary power connectors
2x 8-pin
1x 6-pin + 1x 8-pin
Boost clock speed
-
925 MHz
Core clock speed
830 MHz
-
Floating-point performance
2x 2,549.8 gflops
3,789 gflops
Manufacturing process technology
40 nm
28 nm
Number of transistors
2,640 million
4,313 million
Pipelines / CUDA cores
1536
2048
Power consumption (TDP)
375 Watt
300 Watt
Texture fill rate
79.68
118.4
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
6 GB
Memory bus width
256 Bit
384 Bit
Memory clock speed
5000 MHz
1375 MHz
Memory bandwidth
160.0 GB/s
264 GB/s
Shared memory
-
-
Display Connectors
1x DVI, 4x mini-DisplayPort
1x DVI, 1x HDMI, 2x mini-DisplayPort
Eyefinity
-
+
HDMI
-
+
DisplayPort support
-
-
DirectX
11.2 (11_0)
DirectX® 11
Mantle
-
-
OpenCL
1.2
1.2
OpenGL
4.4
4.6
Shader Model
5.0
5.1
Vulkan
N/A
-
AppAcceleration
-
-
CrossFire
-
1
Enduro
-
-
FreeSync
-
1
HD3D
-
-
PowerTune
-
-
TrueAudio
-
-
ZeroCore
-
-