GeForce GTX 660M Mac Edition and Radeon X850 XT - video card comparison
GeForce GTX 660M Mac Edition
Radeon X850 XT
Architecture
Kepler (2012−2018)
R400 (2004−2008)
GPU code name
GK107
R480
Market segment
Desktop
Desktop
Release date
April 2013
December 2004
Interface
MXM-B (3.0)
PCIe 1.0 x16
Supplementary power connectors
None
1x 6-pin
Core clock speed
950 MHz
520 MHz
Floating-point performance
729.6 gflops
-
Manufacturing process technology
28 nm
130 nm
Number of transistors
1,270 million
160 million
Pipelines / CUDA cores
384
-
Power consumption (TDP)
50 Watt
69 Watt
Texture fill rate
30.40
8.320
Memory type
GDDR5
GDDR3
Maximum RAM amount
512 MB
256 MB
Memory bus width
128 Bit
256 Bit
Memory clock speed
5000 MHz
1080 MHz
Memory bandwidth
80 GB/s
34.56 GB/s
Display Connectors
No outputs
2x DVI, 1x S-Video
DirectX
12 (11_0)
9.0b (9_2)
CUDA
3.0
-
OpenCL
1.2
N/A
OpenGL
4.6
2.0
Shader Model
5.1
-
Vulkan
1.1.126
N/A