GeForce GTX 660M and Radeon R6 M340DX - video card comparison
GeForce GTX 660M
Radeon R6 M340DX
Architecture
Kepler (2012−2018)
GCN (2011−2017)
GPU code name
N13E-GE
Jet
Market segment
Laptop
Laptop
Release date
March 2012
June 2015
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
MXM-B (3.0)
IGP
SLI options
+
-
Boost clock speed
950 MHz
1030 MHz
Core clock speed
835 MHz
-
CUDA cores
384
-
Floating-point performance
729.6 gflops
-
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,270 million
690 million
Pipelines / CUDA cores
384
704
Power consumption (TDP)
50 Watt
-
Texture fill rate
30.4 billion/sec
24.72
Memory type
GDDR5
DDR3
Maximum RAM amount
2 GB
System Shared
Memory bus width
128bit
System Shared
Memory clock speed
2000 MHz
System Shared
Memory bandwidth
64.0 GB/s
-
Shared memory
-
-
Display Connectors
No outputs
No outputs
HDMI
+
-
HDCP
+
-
Maximum VGA resolution
Up to 2048x1536
-
DirectX
12 API
12 (11_1)
CUDA
+
-
OpenCL
1.1
1.2
OpenGL
4.5
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.2.131
Optimus
+
-