GeForce 840M and GeForce GT 620 - video card comparison
Passmark - benchmark score GeForce 840M vs GeForce GT 620
GeForce 840M
1121
GeForce GT 620
388
GeForce 840M
GeForce GT 620
Architecture
Maxwell (2014−2018)
Fermi (2010−2014)
GPU code name
N15S-GT
GF108
Market segment
Laptop
Desktop
Release date
March 2014
May 2012
Bus support
PCI Express 2.0, PCI Express 3.0
PCI Express 2.0
Interface
PCIe 3.0 x8
PCIe 2.0 x16
Supplementary power connectors
-
None
Boost clock speed
1124 MHz
-
Core clock speed
1029 MHz
700 MHz
CUDA cores
-
96
Floating-point performance
863.2 gflops
268.8 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
-
585 million
Pipelines / CUDA cores
384
96
Power consumption (TDP)
33 Watt
49 Watt
Maximum GPU temperature
-
98 °C
Texture fill rate
17.98
11.2 billion/sec
Memory type
DDR3
DDR3
Maximum RAM amount
4 GB
1 GB
Memory bus width
64 Bit
64 Bit
Memory clock speed
2000 MHz
1.8 GB/s
Memory bandwidth
16.02 GB/s
14.4 GB/s
Shared memory
-
-
Display Connectors
No outputs
Dual Link DVI-I, HDMI, VGA
Multi monitor support
-
+
HDMI
-
+
HDCP
-
+
Maximum VGA resolution
-
2048x1536
Audio input for HDMI
-
Internal
DirectX
12 (11_0)
12 (11_0)
CUDA
+
+
OpenCL
1.2
1.1
OpenGL
4.5
4.2
Shader Model
5.1
5.1
Vulkan
1.1.126
N/A
3D Blu-Ray
-
+
GameWorks
+
-
GPU Boost
2.0
-
Optimus
+
-