GeForce GTX 660 and Radeon Sky 900 - video card comparison
GeForce GTX 660
Radeon Sky 900
Architecture
Kepler (2012−2018)
GCN 1.0 (2012−2020)
GPU code name
GK106
Tahiti
Market segment
Desktop
Desktop
Release date
September 2012
March 2013
Bus support
PCI Express 3.0
PCIe 3.0
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
One 6-pin
2x 8-pin
SLI options
+
-
Boost clock speed
1033 MHz
950 MHz
Core clock speed
980 MHz
825 MHz
CUDA cores
960
-
Floating-point performance
1,981 gflops
2x 3,405 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
2,540 million
4,313 million
Pipelines / CUDA cores
960
3584
Power consumption (TDP)
140 Watt
300 Watt
Texture fill rate
78.4 billion/sec
106.4
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
6 GB
Memory bus width
192-bit GDDR5
384 Bit
Memory clock speed
6.0 GB/s
5000 MHz
Memory bandwidth
144.2 GB/s
480 GB/s
Display Connectors
One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPort
1x DVI, 1x mini-DisplayPort
Multi monitor support
4 displays
-
Dual-link DVI support
-
1
HDMI
+
-
HDCP
+
-
Maximum VGA resolution
2048x1536
-
Audio input for HDMI
Internal
-
DirectX
12 (11_0)
12 (11_1)
CUDA
+
-
OpenCL
1.2
1.2
OpenGL
4.3
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.2.131
3D Blu-Ray
+
-
3D Gaming
+
-
3D Vision
+
-