Radeon HD 6970M and GeForce GT 640M Mac Edition - video card comparison
Radeon HD 6970M
GeForce GT 640M Mac Edition
Architecture
Terascale 2 (2009−2015)
Kepler (2012−2018)
GPU code name
Blackcomb XT
GK107
Market segment
Laptop
Desktop
Release date
January 2011
February 2013
Interface
MXM-B (3.0)
PCIe 3.0 x16
Supplementary power connectors
None
-
Core clock speed
680 MHz
745 MHz
Floating-point performance
1,305.6 gflops
572.2 gflops
Manufacturing process technology
40 nm
28 nm
Number of transistors
1,700 million
1,270 million
Pipelines / CUDA cores
960
384
Power consumption (TDP)
75-100 Watt
32 Watt
Texture fill rate
32.64
23.84
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
512 MB
Memory bus width
256 Bit
64 Bit
Memory clock speed
900 MHz
5000 MHz
Memory bandwidth
115.2 GB/s
40 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
11.2 (11_0)
12 (11_0)
CUDA
-
3.0
OpenCL
1.2
1.2
OpenGL
4.4
4.6
Shader Model
5.0
5.1
Vulkan
N/A
1.1.126