Radeon E8950 and GeForce GTX 660M Mac Edition - video card comparison
Radeon E8950
GeForce GTX 660M Mac Edition
Architecture
GCN 3.0 (2014−2017)
Kepler (2012−2018)
GPU code name
Amethyst
GK107
Market segment
Desktop
Desktop
Release date
September 2015
April 2013
Interface
MXM-B (3.0)
MXM-B (3.0)
Supplementary power connectors
None
None
Boost clock speed
1000 MHz
-
Core clock speed
735 MHz
950 MHz
Floating-point performance
4,096 gflops
729.6 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
5,000 million
1,270 million
Pipelines / CUDA cores
2048
384
Power consumption (TDP)
95 Watt
50 Watt
Texture fill rate
128.0
30.40
Memory type
GDDR5
GDDR5
Maximum RAM amount
8 GB
512 MB
Memory bus width
256 Bit
128 Bit
Memory clock speed
6000 MHz
5000 MHz
Memory bandwidth
192.0 GB/s
80 GB/s
Display Connectors
No outputs
No outputs
DirectX
12 (12_0)
12 (11_0)
CUDA
-
3.0
OpenCL
2.0
1.2
OpenGL
4.6
4.6
Shader Model
6.3
5.1
Vulkan
1.2.131
1.1.126