GeForce GTX 660M and Radeon R6 M255DX - video card comparison
Passmark - benchmark score GeForce GTX 660M vs Radeon R6 M255DX
GeForce GTX 660M
1478
Radeon R6 M255DX
623
GeForce GTX 660M
Radeon R6 M255DX
Architecture
Kepler (2012−2018)
GCN (2011−2017)
GPU code name
N13E-GE
Jet UL(T) DDR3
Market segment
Laptop
Laptop
Release date
March 2012
June 2014
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
MXM-B (3.0)
IGP
SLI options
+
-
Boost clock speed
950 MHz
940 MHz
Core clock speed
835 MHz
855 / 514 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
576
Power consumption (TDP)
50 Watt
-
Texture fill rate
30.4 billion/sec
17.10
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
Eyefinity
-
+
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
AppAcceleration
-
+
Optimus
+
-