GeForce GT 640M and Radeon R4 Mobile Graphics - video card comparison
GeForce GT 640M
Radeon R4 Mobile Graphics
Architecture
Kepler (2012−2018)
GCN 2.0 (2013−2017)
GPU code name
N13P-GS
Spectre SL
Market segment
Laptop
Laptop
Release date
March 2012
September 2014
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
PCIe 3.0 x16
IGP
Boost clock speed
645 MHz
655 MHz
Core clock speed
Up to 625 MHz
533 MHz
CUDA cores
384
-
Floating-point performance
480.0 gflops
-
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,270 million
2,410 million
Pipelines / CUDA cores
384
192
Power consumption (TDP)
32 Watt
17 Watt
Texture fill rate
Up to 20.0 billion/sec
6.396
Memory type
DDR3\GDDR5
System Shared
Maximum RAM amount
2 GB
System Shared
Memory bus width
128bit
System Shared
Memory clock speed
1800 - 4000 MHz
System Shared
Memory bandwidth
Up to 64.0 GB/s
-
Shared memory
-
-
Display Connectors
No outputs
No outputs
HDMI
+
-
HDCP
+
-
Maximum VGA resolution
Up to 2048x1536
-
DirectX
12 API
12 (12_0)
CUDA
+
-
OpenCL
1.1
2.0
OpenGL
4.5
4.6
Shader Model
5.1
6.0
Vulkan
1.1.126
1.2.131
3D Blu-Ray
+
-
Optimus
+
-