GeForce GT 820M and GeForce GT 640M LE - video card comparison
Passmark - benchmark score GeForce GT 820M vs GeForce GT 640M LE
GeForce GT 820M
584
GeForce GT 640M LE
720
GeForce GT 820M
GeForce GT 640M LE
Architecture
Fermi 2.0 (2010−2014)
Fermi / Kepler (2012)
GPU code name
GF117
N13P-LP
Market segment
Desktop
Laptop
Release date
November 2013
March 2012
Bus support
-
PCI Express 2.0, PCI Express 3.0
Interface
PCIe 2.0 x16
PCIe 2.0 x16
Core clock speed
775 MHz
Up to 500 MHz
CUDA cores
-
Up to 384
Floating-point performance
297.6 gflops
384.0 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
585 million
585 million
Pipelines / CUDA cores
96
384
Power consumption (TDP)
15 Watt
20 Watt
Texture fill rate
12.40
Up to 16.0 billion/sec
Memory type
DDR3
DDR3\DDR5
Maximum RAM amount
1 GB
2 GB
Memory bus width
64 Bit
128bit
Memory clock speed
1800 MHz
1800 - 4000 MHz
Memory bandwidth
14.4 GB/s
Up to 28.8 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
HDMI
-
+
HDCP
-
+
Maximum VGA resolution
-
Up to 2048x1536
DirectX
12 (11_0)
12 API
CUDA
2.1
+
OpenCL
1.1
1.1
OpenGL
4.6
4.5
Shader Model
5.1
5.1
Vulkan
N/A
N/A
3D Blu-Ray
-
+
Optimus
-
+