GeForce 9400 GT Rev. 2 vs 840A

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Primary details

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

Place in the ranking773not rated
Place by popularitynot in top-100not in top-100
Power efficiency6.49no data
ArchitectureMaxwell (2014−2017)Tesla (2006−2010)
GPU code nameGM108G96C
Market segmentLaptopDesktop
Release date17 March 2014 (10 years ago)27 August 2008 (16 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 cores38416
Core clock speed1029 MHz550 MHz
Boost clock speed1124 MHzno data
Number of transistorsno data314 million
Manufacturing process technology28 nm55 nm
Power consumption (TDP)33 Watt50 Watt
Texture fill rate17.984.400
Floating-point processing power0.8632 TFLOPS0.0448 TFLOPS
ROPs84
TMUs168

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).

InterfacePCIe 3.0 x8PCIe 2.0 x16
Lengthno data168 mm
Widthno data1-slot
Supplementary power connectorsno dataNone

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 typeDDR3GDDR3
Maximum RAM amount2 GB512 MB
Memory bus width64 Bit128 Bit
Memory clock speed1001 MHz400 MHz
Memory bandwidth16.02 GB/s12.8 GB/s

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 outputs1x DVI, 1x VGA, 1x S-Video

API compatibility

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

DirectX12 (11_0)11.1 (10_0)
Shader Model5.14.0
OpenGL4.63.3
OpenCL1.21.1
Vulkan1.1.126N/A
CUDA5.01.1

Pros & cons summary


Recency 17 March 2014 27 August 2008
Maximum RAM amount 2 GB 512 MB
Chip lithography 28 nm 55 nm
Power consumption (TDP) 33 Watt 50 Watt

GeForce 840A has an age advantage of 5 years, a 300% higher maximum VRAM amount, a 96.4% more advanced lithography process, and 51.5% lower power consumption.

We couldn't decide between GeForce 840A and GeForce 9400 GT Rev. 2. We've got no test results to judge.

Be aware that GeForce 840A is a notebook card while GeForce 9400 GT Rev. 2 is a desktop one.


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 840A
GeForce 840A
NVIDIA GeForce 9400 GT Rev. 2
GeForce 9400 GT Rev. 2

Comparisons with similar GPUs

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Community ratings

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3.3 8 votes

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3.8 10 votes

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Questions & comments

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