GeForce GTX 660 and Radeon HD 6870 - video card comparison
Passmark - benchmark score GeForce GTX 660 vs Radeon HD 6870
GeForce GTX 660
4119
Radeon HD 6870
2285
GeForce GTX 660
Radeon HD 6870
Architecture
Kepler (2012−2018)
Terascale 2 (2009−2015)
GPU code name
GK106
RV940 Barts
Market segment
Desktop
Desktop
Release date
September 2012
October 2010
Bus support
PCI Express 3.0
PCIe 2.0 x16
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
One 6-pin
2x 6-pin
SLI options
+
-
Boost clock speed
1033 MHz
900 MHz
Core clock speed
980 MHz
-
CUDA cores
960
-
Floating-point performance
1,981 gflops
2,016.0 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
2,540 million
1,700 million
Pipelines / CUDA cores
960
1120
Power consumption (TDP)
140 Watt
151 Watt
Texture fill rate
78.4 billion/sec
50.40
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
1 GB
Memory bus width
192-bit GDDR5
256 Bit
Memory clock speed
6.0 GB/s
1050 MHz
Memory bandwidth
144.2 GB/s
134.4 GB/s
Shared memory
-
-
Display Connectors
One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPort
2x DVI, 1x HDMI, 2x mini-DisplayPort
Multi monitor support
4 displays
-
Eyefinity
-
1
HDMI
+
+
HDCP
+
-
Maximum VGA resolution
2048x1536
-
DisplayPort support
-
-
Audio input for HDMI
Internal
-
DirectX
12 (11_0)
DirectX® 11
CUDA
+
-
Mantle
-
-
OpenCL
1.2
1.2
OpenGL
4.3
4.4
Shader Model
5.1
5.0
Vulkan
1.1.126
-
3D Blu-Ray
+
-
3D Gaming
+
-
3D Vision
+
-
AppAcceleration
-
-
CrossFire
-
1
Enduro
-
-
HD3D
-
-
PowerTune
-
-
TrueAudio
-
-
ZeroCore
-
-