GeForce 840M and Radeon HD 7660G + HD 7670M Dual Graphics - video card comparison
GeForce 840M
Radeon HD 7660G + HD 7670M Dual Graphics
Architecture
Maxwell (2014−2018)
Terascale 2 (2009−2015)
GPU code name
N15S-GT
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Market segment
Laptop
Laptop
Release date
March 2014
May 2012
Bus support
PCI Express 2.0, PCI Express 3.0
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Interface
PCIe 3.0 x8
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Boost clock speed
1124 MHz
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Core clock speed
1029 MHz
685 / 600 MHz
Floating-point performance
863.2 gflops
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Manufacturing process technology
28 nm
32 nm
Pipelines / CUDA cores
384
862
Power consumption (TDP)
33 Watt
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Texture fill rate
17.98
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Memory type
DDR3
DDR3,GDDR5
Maximum RAM amount
4 GB
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Memory bus width
64 Bit
128 Bit
Memory clock speed
2000 MHz
1800 MHz
Memory bandwidth
16.02 GB/s
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Shared memory
-
-
Display Connectors
No outputs
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DirectX
12 (11_0)
11
CUDA
+
-
OpenCL
1.2
-
OpenGL
4.5
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Shader Model
5.1
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Vulkan
1.1.126
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GameWorks
+
-
GPU Boost
2.0
-
Optimus
+
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