GeForce 820M and Mobility Radeon HD 3870 - video card comparison
GeForce 820M
Mobility Radeon HD 3870
Architecture
Fermi (2010−2014)
RV6xx (2007−2010)
GPU code name
N15V-GM
M88-XT
Market segment
Laptop
Laptop
Release date
January 2014
March 2008
Bus support
PCI Express 2.0
-
Interface
PCIe 2.0 x16
PCIe 2.0 x16
Core clock speed
775 MHz
660 MHz
Floating-point performance
240.0 gflops
422.4 gflops
Manufacturing process technology
28 nm
55 nm
Number of transistors
585 million
666 million
Pipelines / CUDA cores
96
320
Power consumption (TDP)
15 Watt
55 Watt
Texture fill rate
10.00
10.56
Memory type
DDR3
GDDR3
Maximum RAM amount
2 GB
512 MB
Memory bus width
64 Bit
256 Bit
Memory clock speed
1800 MHz
850 MHz
Memory bandwidth
14.4 GB/s
54.4 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
12 (11_0)
10.1 (10_1)
CUDA
+
-
OpenCL
1.1
N/A
OpenGL
4.5
3.3
Shader Model
5.1
4.1
Vulkan
N/A
N/A
GameWorks
+
-
GPU Boost
2.0
-
Optimus
+
-