GeForce 840M and Radeon R7 M340 - video card comparison
Passmark - benchmark score GeForce 840M vs Radeon R7 M340
GeForce 840M
1121
Radeon R7 M340
679
GeForce 840M
Radeon R7 M340
Architecture
Maxwell (2014−2018)
GCN (2011−2017)
GPU code name
N15S-GT
Meso Pro DDR3
Market segment
Laptop
Laptop
Release date
March 2014
June 2015
Bus support
PCI Express 2.0, PCI Express 3.0
PCIe 3.0
Interface
PCIe 3.0 x8
PCIe 3.0 x8
Supplementary power connectors
-
None
Boost clock speed
1124 MHz
1021 MHz
Compute units
-
6
Core clock speed
1029 MHz
1021 MHz
Floating-point performance
863.2 gflops
549.1 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
-
950 million
Pipelines / CUDA cores
384
320
Power consumption (TDP)
33 Watt
-
Texture fill rate
17.98
17.16
Memory type
DDR3
DDR3
Maximum RAM amount
4 GB
4 GB
Memory bus width
64 Bit
128 Bit
Memory clock speed
2000 MHz
1000 MHz
Memory bandwidth
16.02 GB/s
16 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
Eyefinity
-
1
DirectX
12 (11_0)
DirectX® 12
CUDA
+
-
Mantle
-
+
OpenCL
1.2
Not Listed
OpenGL
4.5
4.4
Shader Model
5.1
5.1
Vulkan
1.1.126
+
AppAcceleration
-
-
DualGraphics
-
1
Enduro
-
-
FreeSync
-
1
GameWorks
+
-
GPU Boost
2.0
-
HD3D
-
+
Optimus
+
-
PowerTune
-
+
Switchable graphics
-
1
TrueAudio
-
-
ZeroCore
-
+