GeForce 840A and GeForce 820M - video card comparison
Passmark - benchmark score GeForce 840A vs GeForce 820M
GeForce 840A
1214
GeForce 820M
511
GeForce 840A
GeForce 820M
Architecture
Maxwell (2014−2018)
Fermi (2010−2014)
GPU code name
GM108
N15V-GM
Market segment
Desktop
Laptop
Release date
March 2014
January 2014
Bus support
-
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
2 GB
2 GB
Memory bus width
64 Bit
64 Bit
Memory clock speed
2002 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
5.0
+
OpenCL
1.2
1.1
OpenGL
4.6
4.5
Shader Model
5.1
5.1
Vulkan
1.1.126
N/A
GameWorks
-
+
GPU Boost
-
2.0
Optimus
-
+