Radeon HD 6870 X2 and GeForce GTX 660 Ti - video card comparison
Radeon HD 6870 X2
GeForce GTX 660 Ti
Architecture
TeraScale 2 (2009−2015)
Kepler (2012−2018)
GPU code name
Barts
GK104
Market segment
Desktop
Desktop
Release date
July 2011
August 2012
Bus support
-
PCI Express 3.0
Interface
PCIe 2.0 x16
PCIe 3.0 x16
Supplementary power connectors
-
Two 6-pin
SLI options
-
+
Boost clock speed
-
980 MHz
Core clock speed
900 MHz
915 MHz
CUDA cores
-
1344
Floating-point performance
2x 2,016.0 gflops
2,459.5 gflops
Manufacturing process technology
40 nm
28 nm
Number of transistors
1,700 million
3,540 million
Pipelines / CUDA cores
1120
1344
Power consumption (TDP)
300 Watt
150 Watt
Texture fill rate
50.40
102.5 billion/sec
Memory type
GDDR5
GDDR5
Maximum RAM amount
1 GB
2 GB
Memory bus width
256 Bit
192-bit GDDR5
Memory clock speed
4200 MHz
6.0 GB/s
Memory bandwidth
134.4 GB/s
144.2 GB/s
Shared memory
-
-
Display Connectors
2x DVI, 1x HDMI, 2x mini-DisplayPort
One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPort
Multi monitor support
-
4 displays
HDMI
+
+
HDCP
-
+
Maximum VGA resolution
-
2048x1536
Audio input for HDMI
-
Internal
DirectX
11.2 (11_0)
12 (11_0)
CUDA
-
+
OpenCL
1.2
1.2
OpenGL
4.4
4.3
Shader Model
5.0
5.1
Vulkan
N/A
1.1.126
3D Blu-Ray
-
+
3D Gaming
-
+
3D Vision
-
+