GeForce GT 640M and HD Graphics 620 - video card comparison
Passmark - benchmark score GeForce GT 640M vs HD Graphics 620
GeForce GT 640M
943
HD Graphics 620
963
GeForce GT 640M
HD Graphics 620
Architecture
Kepler (2012−2018)
Gen. 9.5 Kaby Lake (2015−2017)
GPU code name
N13P-GS
Kaby-Lake GT2
Market segment
Laptop
Laptop
Release date
March 2012
August 2016
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
PCIe 3.0 x16
PCIe 3.0 x1
Boost clock speed
645 MHz
1050 MHz
Core clock speed
Up to 625 MHz
300 MHz
CUDA cores
384
-
Floating-point performance
480.0 gflops
403.2 gflops
Manufacturing process technology
28 nm
14 nm
Number of transistors
1,270 million
189 million
Pipelines / CUDA cores
384
24
Power consumption (TDP)
32 Watt
15 Watt
Texture fill rate
Up to 20.0 billion/sec
25.20
Memory type
DDR3\GDDR5
DDR3L/LPDDR3/LPDDR4
Maximum RAM amount
2 GB
32 GB
Memory bus width
128bit
64/128 Bit
Memory clock speed
1800 - 4000 MHz
System Shared
Memory bandwidth
Up to 64.0 GB/s
-
Shared memory
-
+
Display Connectors
No outputs
No outputs
HDMI
+
-
HDCP
+
-
Maximum VGA resolution
Up to 2048x1536
-
DirectX
12 API
12 (12_1)
CUDA
+
-
OpenCL
1.1
2.1
OpenGL
4.5
4.6
Shader Model
5.1
6.4
Vulkan
1.1.126
+
3D Blu-Ray
+
-
Optimus
+
-
Quick Sync
-
+