GeForce GTX 660 and Radeon R9 M390 - video card comparison
GeForce GTX 660
Radeon R9 M390
Architecture
Kepler (2012−2018)
GCN (2011−2017)
GPU code name
GK106
Pitcairn
Market segment
Desktop
Laptop
Release date
September 2012
June 2015
Bus support
PCI Express 3.0
PCIe 3.0
Interface
PCIe 3.0 x16
-
Supplementary power connectors
One 6-pin
-
SLI options
+
-
Boost clock speed
1033 MHz
-
Core clock speed
980 MHz
-
CUDA cores
960
-
Floating-point performance
1,981 gflops
-
Manufacturing process technology
28 nm
28 nm
Number of transistors
2,540 million
5000 Million
Pipelines / CUDA cores
960
1024
Power consumption (TDP)
140 Watt
-
Texture fill rate
78.4 billion/sec
-
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
2 GB
Memory bus width
192-bit GDDR5
256 Bit
Memory clock speed
6.0 GB/s
-
Memory bandwidth
144.2 GB/s
-
Shared memory
-
-
Display Connectors
One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPort
-
Multi monitor support
4 displays
-
Eyefinity
-
1
HDMI
+
-
HDCP
+
-
Maximum VGA resolution
2048x1536
-
Audio input for HDMI
Internal
-
DirectX
12 (11_0)
DirectX® 12
CUDA
+
-
Mantle
-
+
OpenCL
1.2
Not Listed
OpenGL
4.3
4.4
Shader Model
5.1
-
Vulkan
1.1.126
-
3D Blu-Ray
+
-
3D Gaming
+
-
3D Vision
+
-
AppAcceleration
-
-
DualGraphics
-
1
Enduro
-
-
FreeSync
-
1
HD3D
-
+
PowerTune
-
+
Switchable graphics
-
1
TrueAudio
-
-
ZeroCore
-
+