Radeon HD 7770M and GeForce 820M - video card comparison
Radeon HD 7770M
GeForce 820M
Architecture
GCN (2011−2017)
Fermi (2010−2014)
GPU code name
Chelsea XT
N15V-GM
Market segment
Laptop
Laptop
Release date
April 2012
January 2014
Bus support
-
PCI Express 2.0
Interface
PCIe 2.0 x16
PCIe 2.0 x16
Core clock speed
675 MHz
775 MHz
Floating-point performance
691.2 gflops
240.0 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,500 million
585 million
Pipelines / CUDA cores
512
96
Power consumption (TDP)
32 Watt
15 Watt
Texture fill rate
21.60
10.00
Memory type
GDDR5
DDR3
Maximum RAM amount
1 GB
2 GB
Memory bus width
128 Bit
64 Bit
Memory clock speed
4000 MHz
1800 MHz
Memory bandwidth
64 GB/s
14.4 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
12 (11_1)
12 (11_0)
CUDA
-
+
OpenCL
1.2
1.1
OpenGL
4.6
4.5
Shader Model
5.1
5.1
Vulkan
1.2.131
N/A
GameWorks
-
+
GPU Boost
-
2.0
Optimus
-
+