GeForce 840M and Radeon R7 Graphics - video card comparison
GeForce 840M
Radeon R7 Graphics
Architecture
Maxwell (2014−2018)
GCN 2.0 (2013−2017)
GPU code name
N15S-GT
Spectre
Market segment
Laptop
Desktop
Release date
March 2014
January 2014
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
PCIe 3.0 x8
IGP
Boost clock speed
1124 MHz
980 MHz
Core clock speed
1029 MHz
686 MHz
Floating-point performance
863.2 gflops
526.8 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
-
2,410 million
Pipelines / CUDA cores
384
512
Power consumption (TDP)
33 Watt
15 Watt
Texture fill rate
17.98
31.36
Memory type
DDR3
System Shared
Maximum RAM amount
4 GB
System Shared
Memory bus width
64 Bit
System Shared
Memory clock speed
2000 MHz
System Shared
Memory bandwidth
16.02 GB/s
-
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
12 (11_0)
12 (12_0)
CUDA
+
-
OpenCL
1.2
2.0
OpenGL
4.5
4.6
Shader Model
5.1
6.0
Vulkan
1.1.126
1.2.131
GameWorks
+
-
GPU Boost
2.0
-
Optimus
+
-