Mobility Radeon HD 3870 X2 and Radeon HD 7770M - video card comparison
Mobility Radeon HD 3870 X2
Radeon HD 7770M
Architecture
RV6xx (2007−2010)
GCN (2011−2017)
GPU code name
M88-XT CF
Chelsea XT
Market segment
Laptop
Laptop
Release date
September 2008
April 2012
Interface
PCIe 2.0 x16
PCIe 2.0 x16
Core clock speed
660 MHz
675 MHz
Floating-point performance
2x 422.4 gflops
691.2 gflops
Manufacturing process technology
55 nm
28 nm
Number of transistors
666 million
1,500 million
Pipelines / CUDA cores
640
512
Power consumption (TDP)
110 Watt
32 Watt
Texture fill rate
10.56
21.60
Memory type
GDDR3
GDDR5
Maximum RAM amount
512 MB
1 GB
Memory bus width
256 Bit
128 Bit
Memory clock speed
850 MHz
4000 MHz
Memory bandwidth
54.4 GB/s
64 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
10.1 (10_1)
12 (11_1)
OpenCL
N/A
1.2
OpenGL
3.3
4.6
Shader Model
4.1
5.1
Vulkan
N/A
1.2.131