Radeon HD 7770M and Mobility Radeon HD 4870 - video card comparison
Radeon HD 7770M
Mobility Radeon HD 4870
Architecture
GCN (2011−2017)
Terascale 1 (2008−2010)
GPU code name
Chelsea XT
M98-XT
Market segment
Laptop
Laptop
Release date
April 2012
January 2009
Interface
PCIe 2.0 x16
PCIe 2.0 x16
Core clock speed
675 MHz
550 MHz
Floating-point performance
691.2 gflops
880.0 gflops
Manufacturing process technology
28 nm
55 nm
Number of transistors
1,500 million
956 million
Pipelines / CUDA cores
512
800
Power consumption (TDP)
32 Watt
-
Texture fill rate
21.60
22.00
Memory type
GDDR5
GDDR5
Maximum RAM amount
1 GB
1 GB
Memory bus width
128 Bit
256 Bit
Memory clock speed
4000 MHz
888 MHz
Memory bandwidth
64 GB/s
56.83 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
12 (11_1)
10.1 (10_1)
OpenCL
1.2
1.1
OpenGL
4.6
3.3
Shader Model
5.1
4.1
Vulkan
1.2.131
N/A