GeForce GT 640M and Quadro K420 - video card comparison
Passmark - benchmark score GeForce GT 640M vs Quadro K420
GeForce GT 640M
946
Quadro K420
768
GeForce GT 640M
Quadro K420
Architecture
Kepler (2012−2018)
Kepler (2012−2018)
GPU code name
N13P-GS
GK107
Market segment
Laptop
Workstation
Release date
March 2012
July 2014
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
-
None
Boost clock speed
645 MHz
-
Core clock speed
Up to 625 MHz
876 MHz
CUDA cores
384
-
Floating-point performance
480.0 gflops
336.4 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,270 million
1,270 million
Pipelines / CUDA cores
384
192
Power consumption (TDP)
32 Watt
41 Watt
Texture fill rate
Up to 20.0 billion/sec
14.02
Memory type
DDR3\GDDR5
128 Bit
Maximum RAM amount
2 GB
1 GB/2 GB
Memory bus width
128bit
128 Bit
Memory clock speed
1800 - 4000 MHz
1782 MHz
Memory bandwidth
Up to 64.0 GB/s
Up to 29 GB/s
Shared memory
-
-
Display Connectors
No outputs
DVI-I DP
Number of simultaneous displays
-
4
HDMI
+
-
HDCP
+
-
Maximum VGA resolution
Up to 2048x1536
-
DirectX
12 API
12
CUDA
+
3.0
OpenCL
1.1
1.2
OpenGL
4.5
4.5
Shader Model
5.1
5
Vulkan
1.1.126
+
3D Blu-Ray
+
-
3D Vision Pro
-
+
Mosaic
-
+
nView Desktop Management
-
+
Optimus
+
-