GeForce 840M and Radeon HD 6670 - video card comparison
Passmark - benchmark score GeForce 840M vs Radeon HD 6670
GeForce 840M
1121
Radeon HD 6670
752
GeForce 840M
Radeon HD 6670
Architecture
Maxwell (2014−2018)
TeraScale 2 (2009−2015)
GPU code name
N15S-GT
Turks
Market segment
Laptop
Desktop
Release date
March 2014
April 2011
Bus support
PCI Express 2.0, PCI Express 3.0
PCIe 2.0 x16
Interface
PCIe 3.0 x8
PCIe 2.0 x16
Supplementary power connectors
-
None
Boost clock speed
1124 MHz
800 MHz
Core clock speed
1029 MHz
-
Floating-point performance
863.2 gflops
768.0 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
-
716 million
Pipelines / CUDA cores
384
480
Power consumption (TDP)
33 Watt
66 Watt
Texture fill rate
17.98
19.20
Memory type
DDR3
GDDR5
Maximum RAM amount
4 GB
1 GB
Memory bus width
64 Bit
128 Bit
Memory clock speed
2000 MHz
1050 MHz
Memory bandwidth
16.02 GB/s
64 GB/s
Shared memory
-
-
Display Connectors
No outputs
1x DVI, 1x HDMI, 1x VGA
Eyefinity
-
1
HDMI
-
+
DisplayPort support
-
-
DirectX
12 (11_0)
DirectX® 11
CUDA
+
-
Mantle
-
-
OpenCL
1.2
1.2
OpenGL
4.5
4.4
Shader Model
5.1
5.0
Vulkan
1.1.126
-
AppAcceleration
-
-
CrossFire
-
1
Enduro
-
-
GameWorks
+
-
GPU Boost
2.0
-
HD3D
-
-
Optimus
+
-
PowerTune
-
-
TrueAudio
-
-
ZeroCore
-
-