Radeon HD 7990 and Radeon HD 6870 X2 - video card comparison
Radeon HD 7990
Radeon HD 6870 X2
Architecture
GCN 1.0 (2012−2020)
TeraScale 2 (2009−2015)
GPU code name
Malta
Barts
Market segment
Desktop
Desktop
Release date
April 2013
July 2011
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
2x 8-pin
-
Boost clock speed
1000 MHz
-
Core clock speed
950 MHz
900 MHz
Floating-point performance
2x 4,096 gflops
2x 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)
375 Watt
300 Watt
Texture fill rate
128.0
50.40
Memory type
GDDR5
GDDR5
Maximum RAM amount
3 GB
1 GB
Memory bus width
384 Bit
256 Bit
Memory clock speed
6000 MHz
4200 MHz
Memory bandwidth
288.0 GB/s
134.4 GB/s
Display Connectors
1x DVI, 4x mini-DisplayPort
2x DVI, 1x HDMI, 2x mini-DisplayPort
HDMI
-
+
DirectX
12 (11_1)
11.2 (11_0)
OpenCL
1.2
1.2
OpenGL
4.6
4.4
Shader Model
5.1
5.0
Vulkan
1.2.131
N/A