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GeForce 840M vs GeForce 9400 GT 256MB

Intro

The GeForce 840M comes with a clock speed of 1029 MHz and a DDR3 memory frequency of 1000 MHz. It also uses a 64-bit bus, and makes use of a 28 nm design. It is comprised of 384 SPUs, 24 Texture Address Units, and 8 Raster Operation Units.

Compare those specs to the GeForce 9400 GT 256MB, which makes use of a 65 nm design. nVidia has clocked the core speed at 550 MHz. The GDDR2 RAM works at a speed of 400 MHz on this specific card. It features 16 SPUs as well as 8 Texture Address Units and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M 30 Watts
GeForce 9400 GT 256MB 50 Watts
Difference: 20 Watts (67%)

Memory Bandwidth

Theoretically, the GeForce 840M should perform quite a bit faster than the GeForce 9400 GT 256MB overall. (explain)

GeForce 840M 16000 MB/sec
GeForce 9400 GT 256MB 12800 MB/sec
Difference: 3200 (25%)

Texel Rate

The GeForce 840M will be a lot (more or less 461%) faster with regards to texture filtering than the GeForce 9400 GT 256MB. (explain)

GeForce 840M 24696 Mtexels/sec
GeForce 9400 GT 256MB 4400 Mtexels/sec
Difference: 20296 (461%)

Pixel Rate

The GeForce 840M should be quite a bit (more or less 274%) more effective at anti-aliasing than the GeForce 9400 GT 256MB, and will be capable of handling higher resolutions better. (explain)

GeForce 840M 8232 Mpixels/sec
GeForce 9400 GT 256MB 2200 Mpixels/sec
Difference: 6032 (274%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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GeForce 840M

Amazon.com

Check prices at:

GeForce 9400 GT 256MB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce 840M GeForce 9400 GT 256MB
Manufacturer nVidia nVidia
Year March 12 2014 August 2008
Code Name GM108 G96a
Memory 2048 MB 256 MB
Core Speed 1029 MHz 550 MHz
Memory Speed 2000 MHz 800 MHz
Power (Max TDP) 30 watts 50 watts
Bandwidth 16000 MB/sec 12800 MB/sec
Texel Rate 24696 Mtexels/sec 4400 Mtexels/sec
Pixel Rate 8232 Mpixels/sec 2200 Mpixels/sec
Unified Shaders 384 16
Texture Mapping Units 24 8
Render Output Units 8 4
Bus Type DDR3 GDDR2
Bus Width 64-bit 128-bit
Fab Process 28 nm 65 nm
Transistors (Unknown) million 314 million
Bus PCIe 3.0 x16 PCIe x16 2.0, PCI
DirectX Version DirectX 12 DirectX 10
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce 840M

Amazon.com

Check prices at:

GeForce 9400 GT 256MB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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