Mobility Radeon HD 3870 X2 and GeForce 820M - video card comparison
Mobility Radeon HD 3870 X2
GeForce 820M
Architecture
RV6xx (2007−2010)
Fermi (2010−2014)
GPU code name
M88-XT CF
N15V-GM
Market segment
Laptop
Laptop
Release date
September 2008
January 2014
Bus support
-
PCI Express 2.0
Interface
PCIe 2.0 x16
PCIe 2.0 x16
Core clock speed
660 MHz
775 MHz
Floating-point performance
2x 422.4 gflops
240.0 gflops
Manufacturing process technology
55 nm
28 nm
Number of transistors
666 million
585 million
Pipelines / CUDA cores
640
96
Power consumption (TDP)
110 Watt
15 Watt
Texture fill rate
10.56
10.00
Memory type
GDDR3
DDR3
Maximum RAM amount
512 MB
2 GB
Memory bus width
256 Bit
64 Bit
Memory clock speed
850 MHz
1800 MHz
Memory bandwidth
54.4 GB/s
14.4 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
10.1 (10_1)
12 (11_0)
CUDA
-
+
OpenCL
N/A
1.1
OpenGL
3.3
4.5
Shader Model
4.1
5.1
Vulkan
N/A
N/A
GameWorks
-
+
GPU Boost
-
2.0
Optimus
-
+