Radeon HD 7870M and Mobility Radeon HD 3870 X2 - video card comparison
Radeon HD 7870M
Mobility Radeon HD 3870 X2
Architecture
GCN (2011−2017)
RV6xx (2007−2010)
GPU code name
Heathrow XT
M88-XT CF
Market segment
Laptop
Laptop
Release date
April 2012
September 2008
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Core clock speed
800 MHz
660 MHz
Floating-point performance
1,024 gflops
2x 422.4 gflops
Manufacturing process technology
28 nm
55 nm
Number of transistors
1,500 million
666 million
Pipelines / CUDA cores
640
640
Power consumption (TDP)
45 Watt
110 Watt
Texture fill rate
32.00
10.56
Memory type
GDDR5
GDDR3
Maximum RAM amount
2 GB
512 MB
Memory bus width
128 Bit
256 Bit
Memory clock speed
4000 MHz
850 MHz
Memory bandwidth
64 GB/s
54.4 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
12 (11_1)
10.1 (10_1)
OpenCL
1.2
N/A
OpenGL
4.6
3.3
Shader Model
5.1
4.1
Vulkan
1.2.131
N/A