GeForce GT 640M Mac Edition and Radeon X1900 GT - video card comparison
GeForce GT 640M Mac Edition
Radeon X1900 GT
Architecture
Kepler (2012−2018)
R500 (2005−2007)
GPU code name
GK107
R580
Market segment
Desktop
Desktop
Release date
February 2013
May 2006
Interface
PCIe 3.0 x16
PCIe 1.0 x16
Supplementary power connectors
-
1x 6-pin
Core clock speed
745 MHz
575 MHz
Floating-point performance
572.2 gflops
-
Manufacturing process technology
28 nm
90 nm
Number of transistors
1,270 million
384 million
Pipelines / CUDA cores
384
-
Power consumption (TDP)
32 Watt
75 Watt
Texture fill rate
23.84
6.900
Memory type
GDDR5
GDDR3
Maximum RAM amount
512 MB
256 MB
Memory bus width
64 Bit
256 Bit
Memory clock speed
5000 MHz
1200 MHz
Memory bandwidth
40 GB/s
38.4 GB/s
Display Connectors
No outputs
2x DVI, 1x S-Video
DirectX
12 (11_0)
9.0c (9_3)
CUDA
3.0
-
OpenCL
1.2
N/A
OpenGL
4.6
2.0
Shader Model
5.1
3.0
Vulkan
1.1.126
N/A