GeForce 820M and GeForce 8800 GTS 640 - video card comparison
GeForce 820M
GeForce 8800 GTS 640
Architecture
Fermi (2010−2014)
Tesla (2006−2010)
GPU code name
N15V-GM
G80
Market segment
Laptop
Desktop
Release date
January 2014
November 2006
Bus support
PCI Express 2.0
-
Interface
PCIe 2.0 x16
PCIe 1.0 x16
Supplementary power connectors
-
1x 6-pin
Core clock speed
775 MHz
513 MHz
Floating-point performance
240.0 gflops
228.1 gflops
Manufacturing process technology
28 nm
90 nm
Number of transistors
585 million
681 million
Pipelines / CUDA cores
96
96
Power consumption (TDP)
15 Watt
143 Watt
Texture fill rate
10.00
24.62
Memory type
DDR3
GDDR3
Maximum RAM amount
2 GB
640 MB
Memory bus width
64 Bit
320 Bit
Memory clock speed
1800 MHz
1584 MHz
Memory bandwidth
14.4 GB/s
63.36 GB/s
Shared memory
-
-
Display Connectors
No outputs
2x DVI, 1x S-Video
DirectX
12 (11_0)
11.1 (10_0)
CUDA
+
+
OpenCL
1.1
1.1
OpenGL
4.5
3.3
Shader Model
5.1
4.0
Vulkan
N/A
N/A
GameWorks
+
-
GPU Boost
2.0
-
Optimus
+
-