GeForce 840M and GeForce GT 555M - video card comparison
Passmark - benchmark score GeForce 840M vs GeForce GT 555M
GeForce 840M
1121
GeForce GT 555M
674
GeForce 840M
GeForce GT 555M
Architecture
Maxwell (2014−2018)
Fermi (2010−2014)
GPU code name
N15S-GT
N12E-GE-B
Market segment
Laptop
Laptop
Release date
March 2014
January 2011
Bus support
PCI Express 2.0, PCI Express 3.0
PCI Express 2.0
Interface
PCIe 3.0 x8
PCIe 2.0 x16
SLI options
-
+
Boost clock speed
1124 MHz
753 MHz
Core clock speed
1029 MHz
Up to 753 MHz
CUDA cores
-
Up to 144
Floating-point performance
863.2 gflops
388.8 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
-
1,170 million
Pipelines / CUDA cores
384
144
Power consumption (TDP)
33 Watt
35 Watt
Texture fill rate
17.98
Up to 16.2 billion/sec
Memory type
DDR3
DDR3\DDR5
Maximum RAM amount
4 GB
3 GB
Memory bus width
64 Bit
Up to 192 bit/128 Bit
Memory clock speed
2000 MHz
Up to 1569 MHz
Memory bandwidth
16.02 GB/s
Up to 50.2 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
3D Blu-Ray
-
+
3D Gaming
-
+
GameWorks
+
-
GPU Boost
2.0
-
Optimus
+
+