GeForce GT 640M and GeForce GT 555M - video card comparison
Passmark - benchmark score GeForce GT 640M vs GeForce GT 555M
GeForce GT 640M
943
GeForce GT 555M
674
GeForce GT 640M
GeForce GT 555M
Architecture
Kepler (2012−2018)
Fermi (2010−2014)
GPU code name
N13P-GS
N12E-GE-B
Market segment
Laptop
Laptop
Release date
March 2012
January 2011
Bus support
PCI Express 2.0, PCI Express 3.0
PCI Express 2.0
Interface
PCIe 3.0 x16
PCIe 2.0 x16
SLI options
-
+
Boost clock speed
645 MHz
753 MHz
Core clock speed
Up to 625 MHz
Up to 753 MHz
CUDA cores
384
Up to 144
Floating-point performance
480.0 gflops
388.8 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
1,270 million
1,170 million
Pipelines / CUDA cores
384
144
Power consumption (TDP)
32 Watt
35 Watt
Texture fill rate
Up to 20.0 billion/sec
Up to 16.2 billion/sec
Memory type
DDR3\GDDR5
DDR3\DDR5
Maximum RAM amount
2 GB
3 GB
Memory bus width
128bit
Up to 192 bit/128 Bit
Memory clock speed
1800 - 4000 MHz
Up to 1569 MHz
Memory bandwidth
Up to 64.0 GB/s
Up to 50.2 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
HDMI
+
-
HDCP
+
-
Maximum VGA resolution
Up to 2048x1536
-
DirectX
12 API
12 API
CUDA
+
+
OpenCL
1.1
1.1
OpenGL
4.5
4.5
Shader Model
5.1
5.1
Vulkan
1.1.126
N/A
3D Blu-Ray
+
+
3D Gaming
-
+
Optimus
+
+