Radeon HD 7870M and GeForce 840M - video card comparison
Passmark - benchmark score Radeon HD 7870M vs GeForce 840M
Radeon HD 7870M
1552
GeForce 840M
1121
Radeon HD 7870M
GeForce 840M
Architecture
GCN (2011−2017)
Maxwell (2014−2018)
GPU code name
Heathrow XT
N15S-GT
Market segment
Laptop
Laptop
Release date
April 2012
March 2014
Bus support
-
PCI Express 2.0, PCI Express 3.0
Interface
PCIe 3.0 x16
PCIe 3.0 x8
Boost clock speed
-
1124 MHz
Core clock speed
800 MHz
1029 MHz
Floating-point performance
1,024 gflops
863.2 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,500 million
-
Pipelines / CUDA cores
640
384
Power consumption (TDP)
45 Watt
33 Watt
Texture fill rate
32.00
17.98
Memory type
GDDR5
DDR3
Maximum RAM amount
2 GB
4 GB
Memory bus width
128 Bit
64 Bit
Memory clock speed
4000 MHz
2000 MHz
Memory bandwidth
64 GB/s
16.02 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
12 (11_1)
12 (11_0)
CUDA
-
+
OpenCL
1.2
1.2
OpenGL
4.6
4.5
Shader Model
5.1
5.1
Vulkan
1.2.131
1.1.126
GameWorks
-
+
GPU Boost
-
2.0
Optimus
-
+