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GeForce 940M vs Radeon HD 4890 1GB

Intro

The GeForce 940M comes with a GPU clock speed of 1072 MHz, and the 2048 MB of DDR3 RAM runs at 1000 MHz through a 64-bit bus. It also features 384 SPUs, 24 Texture Address Units, and 8 ROPs.

Compare all of that to the Radeon HD 4890 1GB, which has a clock speed of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also makes use of a 256-bit memory bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4890 1GB should be much faster than the GeForce 940M overall. (explain)

Radeon HD 4890 1GB 124800 MB/sec
GeForce 940M 16000 MB/sec
Difference: 108800 (680%)

Texel Rate

The Radeon HD 4890 1GB should be a lot (more or less 55%) better at anisotropic filtering than the GeForce 940M. (explain)

Radeon HD 4890 1GB 40000 Mtexels/sec
GeForce 940M 25728 Mtexels/sec
Difference: 14272 (55%)

Pixel Rate

The Radeon HD 4890 1GB is much (more or less 87%) better at AA than the GeForce 940M, and also able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 4890 1GB 16000 Mpixels/sec
GeForce 940M 8576 Mpixels/sec
Difference: 7424 (87%)

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 940M

Amazon.com

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Radeon HD 4890 1GB

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 940M Radeon HD 4890 1GB
Manufacturer nVidia AMD
Year March 12 2015 Apr 2, 2009
Code Name GM108 RV790 XT
Memory 2048 MB 1024 MB
Core Speed 1072 MHz 1000 MHz
Memory Speed 2000 MHz 3900 MHz
Power (Max TDP) (Unknown) watts 190 watts
Bandwidth 16000 MB/sec 124800 MB/sec
Texel Rate 25728 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 8576 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 384 800(160x5)
Texture Mapping Units 24 40
Render Output Units 8 16
Bus Type DDR3 GDDR5
Bus Width 64-bit 256-bit
Fab Process 28 nm 55 nm
Transistors (Unknown) million 959 million
Bus PCIe 3.0 x16 PCIe 2.0 x16
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of information (in units of MB per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce 940M

Amazon.com

Check prices at:

Radeon HD 4890 1GB

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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