Radeon HD 7970 and Radeon HD 6870 - video card comparison
Passmark - benchmark score Radeon HD 7970 vs Radeon HD 6870
Radeon HD 7970
5405
Radeon HD 6870
2285
Radeon HD 7970
Radeon HD 6870
Architecture
GCN (2011−2017)
Terascale 2 (2009−2015)
GPU code name
Tahiti XT
RV940 Barts
Market segment
Desktop
Desktop
Release date
December 2011
October 2010
Bus support
PCIe 2.1 x16
PCIe 2.0 x16
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
1x 6-pin + 1x 8-pin
2x 6-pin
Boost clock speed
925 MHz
900 MHz
Floating-point performance
3,789 gflops
2,016.0 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
4,313 million
1,700 million
Pipelines / CUDA cores
2048
1120
Power consumption (TDP)
300 Watt
151 Watt
Texture fill rate
118.4
50.40
Memory type
GDDR5
GDDR5
Maximum RAM amount
6 GB
1 GB
Memory bus width
384 Bit
256 Bit
Memory clock speed
1375 MHz
1050 MHz
Memory bandwidth
264 GB/s
134.4 GB/s
Shared memory
-
-
Display Connectors
1x DVI, 1x HDMI, 2x mini-DisplayPort
2x DVI, 1x HDMI, 2x mini-DisplayPort
Eyefinity
+
1
HDMI
+
+
DisplayPort support
-
-
DirectX
DirectX® 11
DirectX® 11
Mantle
-
-
OpenCL
1.2
1.2
OpenGL
4.6
4.4
Shader Model
5.1
5.0
AppAcceleration
-
-
CrossFire
1
1
Enduro
-
-
FreeSync
1
-
HD3D
-
-
PowerTune
-
-
TrueAudio
-
-
ZeroCore
-
-