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GeForce 840M vs GeForce 9400 GT 256MB

Intro

The GeForce 840M comes with core speeds of 1029 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 384 SPUs along with 24 TAUs and 8 ROPs.

Compare those specs to the GeForce 9400 GT 256MB, which has a core clock frequency of 550 MHz and a GDDR2 memory speed of 400 MHz. It also makes use of a 128-bit bus, and makes use of a 65 nm design. It is made up of 16 SPUs, 8 Texture Address Units, and 4 Raster Operation 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

The GeForce 840M should theoretically be 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 is quite a bit (more or less 461%) better at anisotropic 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 also able to handle 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

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.

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 largest amount of information (in units of megabytes per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total texture units 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

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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