GeForce GTX 660M Mac Edition and Radeon HD 2900 GT - video card comparison
GeForce GTX 660M Mac Edition
Radeon HD 2900 GT
Architecture
Kepler (2012−2018)
TeraScale (2005−2013)
GPU code name
GK107
R600
Market segment
Desktop
Desktop
Release date
April 2013
November 2007
Interface
MXM-B (3.0)
PCIe 1.0 x16
Supplementary power connectors
None
1x 8-pin
Core clock speed
950 MHz
601 MHz
Floating-point performance
729.6 gflops
288.48 gflops
Manufacturing process technology
28 nm
80 nm
Number of transistors
1,270 million
720 million
Pipelines / CUDA cores
384
240
Power consumption (TDP)
50 Watt
150 Watt
Texture fill rate
30.40
7.212
Memory type
GDDR5
GDDR3
Maximum RAM amount
512 MB
256 MB
Memory bus width
128 Bit
256 Bit
Memory clock speed
5000 MHz
1600 MHz
Memory bandwidth
80 GB/s
51.2 GB/s
Display Connectors
No outputs
2x DVI, 1x S-Video
DirectX
12 (11_0)
10.0 (10_0)
CUDA
3.0
-
OpenCL
1.2
N/A
OpenGL
4.6
3.3
Shader Model
5.1
4.0
Vulkan
1.1.126
N/A