GeForce 840M and GeForce 820M - video card comparison
Passmark - benchmark score GeForce 840M vs GeForce 820M
GeForce 840M
1121
GeForce 820M
511
GeForce 840M
GeForce 820M
Architecture
Maxwell (2014−2018)
Fermi (2010−2014)
GPU code name
N15S-GT
N15V-GM
Market segment
Laptop
Laptop
Release date
March 2014
January 2014
Bus support
PCI Express 2.0, PCI Express 3.0
PCI Express 2.0
Interface
PCIe 3.0 x8
PCIe 2.0 x16
Boost clock speed
1124 MHz
-
Core clock speed
1029 MHz
775 MHz
Floating-point performance
863.2 gflops
240.0 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
-
585 million
Pipelines / CUDA cores
384
96
Power consumption (TDP)
33 Watt
15 Watt
Texture fill rate
17.98
10.00
Memory type
DDR3
DDR3
Maximum RAM amount
4 GB
2 GB
Memory bus width
64 Bit
64 Bit
Memory clock speed
2000 MHz
1800 MHz
Memory bandwidth
16.02 GB/s
14.4 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
12 (11_0)
12 (11_0)
CUDA
+
+
OpenCL
1.2
1.1
OpenGL
4.5
4.5
Shader Model
5.1
5.1
Vulkan
1.1.126
N/A
GameWorks
+
+
GPU Boost
2.0
2.0
Optimus
+
+