GeForce GTX 680MX Mac Edition vs 840M

Primary details

GPU architecture, market segment, value for money and other general parameters compared.

Place in the ranking787not rated
Place by popularitynot in top-100not in top-100
Power efficiency6.19no data
ArchitectureMaxwell (2014−2017)Kepler (2012−2018)
GPU code nameGM108GK104
Market segmentLaptopLaptop
Release date12 March 2014 (10 years ago)23 October 2012 (12 years ago)

Detailed specifications

General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.

Pipelines / CUDA cores3841536
Core clock speed1029 MHz719 MHz
Boost clock speed1124 MHzno data
Number of transistorsno data3,540 million
Manufacturing process technology28 nm28 nm
Power consumption (TDP)33 Watt122 Watt
Texture fill rate17.9892.03
Floating-point processing power0.8632 TFLOPS2.209 TFLOPS
ROPs832
TMUs16128

Form factor & compatibility

Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).

Laptop sizemedium sizedno data
Bus supportPCI Express 2.0, PCI Express 3.0no data
InterfacePCIe 3.0 x8PCIe 3.0 x16

VRAM capacity and type

Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.

Memory typeDDR3GDDR5
Maximum RAM amount4 GB2 GB
Memory bus width64 Bit256 Bit
Memory clock speed1001 MHz1250 MHz
Memory bandwidth16.02 GB/s160.0 GB/s
Shared memory--

Connectivity and outputs

Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.

Display ConnectorsNo outputsNo outputs

Supported technologies

Supported technological solutions. This information will prove useful if you need some particular technology for your purposes.

GPU Boost2.0no data
Optimus+-
GameWorks+-

API compatibility

List of supported 3D and general-purpose computing APIs, including their specific versions.

DirectX12 (11_0)12 (11_0)
Shader Model5.15.1
OpenGL4.54.6
OpenCL1.21.2
Vulkan1.1.1261.1.126
CUDA+3.0

Pros & cons summary


Recency 12 March 2014 23 October 2012
Maximum RAM amount 4 GB 2 GB
Power consumption (TDP) 33 Watt 122 Watt

GeForce 840M has an age advantage of 1 year, a 100% higher maximum VRAM amount, and 269.7% lower power consumption.

We couldn't decide between GeForce 840M and GeForce GTX 680MX Mac Edition. We've got no test results to judge.


Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.

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NVIDIA GeForce 840M
GeForce 840M
NVIDIA GeForce GTX 680MX Mac Edition
GeForce GTX 680MX Mac Edition

Comparisons with similar GPUs

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Community ratings

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3.4 913 votes

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3.8 6 votes

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Questions & comments

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