GeForce 840M and GeForce GT 425M - video card comparison
Passmark - benchmark score GeForce 840M vs GeForce GT 425M
GeForce 840M
1121
GeForce GT 425M
543
GeForce 840M
GeForce GT 425M
Architecture
Maxwell (2014−2018)
Fermi (2010−2014)
GPU code name
N15S-GT
N11P-GS
Market segment
Laptop
Laptop
Release date
March 2014
August 2010
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
PCIe 3.0 x8
PCIe 2.0 x16
Boost clock speed
1124 MHz
-
Core clock speed
1029 MHz
560 MHz
CUDA cores
-
96
Floating-point performance
863.2 gflops
215.04 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
-
585 million
Pipelines / CUDA cores
384
96
Power consumption (TDP)
33 Watt
23 Watt
Texture fill rate
17.98
6.7 billion/sec
Memory type
DDR3
DDR3
Maximum RAM amount
4 GB
1 GB
Memory bus width
64 Bit
128 Bit
Memory clock speed
2000 MHz
800 MHz
Memory bandwidth
16.02 GB/s
25.6 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
12 (11_0)
12 API
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
-
Optimus
+
-