GeForce 840M and Radeon HD 8770M - video card comparison
GeForce 840M
Radeon HD 8770M
Architecture
Maxwell (2014−2018)
GCN (2011−2017)
GPU code name
N15S-GT
Mars
Market segment
Laptop
Laptop
Release date
March 2014
November 2012
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
PCIe 3.0 x8
PCIe 3.0 x8
Boost clock speed
1124 MHz
825 MHz
Core clock speed
1029 MHz
775 MHz
Floating-point performance
863.2 gflops
633.6 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
-
950 million
Pipelines / CUDA cores
384
384
Power consumption (TDP)
33 Watt
-
Texture fill rate
17.98
19.80
Memory type
DDR3
GDDR5
Maximum RAM amount
4 GB
2 GB
Memory bus width
64 Bit
128 Bit
Memory clock speed
2000 MHz
4500 MHz
Memory bandwidth
16.02 GB/s
72 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
12 (11_0)
12 (11_1)
CUDA
+
-
OpenCL
1.2
1.2
OpenGL
4.5
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.2.131
GameWorks
+
-
GPU Boost
2.0
-
Optimus
+
-