GeForce 840M and HD Graphics 405 - video card comparison
GeForce 840M
HD Graphics 405
Architecture
Maxwell (2014−2018)
Gen. 8 (2015−2016)
GPU code name
N15S-GT
Braswell
Market segment
Laptop
Laptop
Release date
March 2014
April 2016
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
PCIe 3.0 x8
PCIe 3.0 x1
Boost clock speed
1124 MHz
700 MHz
Core clock speed
1029 MHz
320 MHz
Floating-point performance
863.2 gflops
213.1 gflops
Manufacturing process technology
28 nm
14 nm
Number of transistors
-
189 million
Pipelines / CUDA cores
384
16
Power consumption (TDP)
33 Watt
6 Watt
Texture fill rate
17.98
11.20
Memory type
DDR3
System Shared
Maximum RAM amount
4 GB
System Shared
Memory bus width
64 Bit
64/128 Bit
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 (11_1)
CUDA
+
-
OpenCL
1.2
2.0
OpenGL
4.5
4.3
Shader Model
5.1
5.1
Vulkan
1.1.126
1.1.80
GameWorks
+
-
GPU Boost
2.0
-
Optimus
+
-