Radeon HD 3850 and GeForce GT 640M Mac Edition - video card comparison
Radeon HD 3850
GeForce GT 640M Mac Edition
Architecture
TeraScale (2005−2013)
Kepler (2012−2018)
GPU code name
RV670
GK107
Market segment
Desktop
Desktop
Release date
November 2007
February 2013
Interface
PCIe 2.0 x16
PCIe 3.0 x16
Supplementary power connectors
1x 6-pin
-
Core clock speed
668 MHz
745 MHz
Floating-point performance
427.5 gflops
572.2 gflops
Manufacturing process technology
55 nm
28 nm
Number of transistors
666 million
1,270 million
Pipelines / CUDA cores
320
384
Power consumption (TDP)
75 Watt
32 Watt
Texture fill rate
10.69
23.84
Memory type
GDDR3
GDDR5
Maximum RAM amount
1 GB
512 MB
Memory bus width
256 Bit
64 Bit
Memory clock speed
1660 MHz
5000 MHz
Memory bandwidth
53.12 GB/s
40 GB/s
Display Connectors
2x DVI, 1x S-Video
No outputs
DirectX
10.1 (10_1)
12 (11_0)
CUDA
-
3.0
OpenCL
N/A
1.2
OpenGL
3.3
4.6
Shader Model
4.1
5.1
Vulkan
N/A
1.1.126