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GeForce 940M vs Radeon HD 4770

Intro

The GeForce 940M has core speeds of 1072 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 384 SPUs along with 24 Texture Address Units and 8 Rasterization Operator Units.

Compare that to the Radeon HD 4770, which comes with a core clock speed of 750 MHz and a GDDR5 memory speed of 800 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 4770 should in theory be a lot superior to the GeForce 940M overall. (explain)

Radeon HD 4770 51200 MB/sec
GeForce 940M 16000 MB/sec
Difference: 35200 (220%)

Texel Rate

The GeForce 940M is a bit (about 7%) better at anisotropic filtering than the Radeon HD 4770. (explain)

GeForce 940M 25728 Mtexels/sec
Radeon HD 4770 24000 Mtexels/sec
Difference: 1728 (7%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4770 is the winner, by far. (explain)

Radeon HD 4770 12000 Mpixels/sec
GeForce 940M 8576 Mpixels/sec
Difference: 3424 (40%)

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

Check prices at:

Radeon HD 4770

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 4770
Manufacturer nVidia AMD
Year March 12 2015 Apr 28, 2009
Code Name GM108 RV740
Memory 2048 MB 512 MB
Core Speed 1072 MHz 750 MHz
Memory Speed 2000 MHz 3200 MHz
Power (Max TDP) (Unknown) watts 80 watts
Bandwidth 16000 MB/sec 51200 MB/sec
Texel Rate 25728 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 8576 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 384 640(128x5)
Texture Mapping Units 24 32
Render Output Units 8 16
Bus Type DDR3 GDDR5
Bus Width 64-bit 128-bit
Fab Process 28 nm 40 nm
Transistors (Unknown) million 826 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: Memory bandwidth is the largest amount of information (counted in MB per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce 940M

Amazon.com

Check prices at:

Radeon HD 4770

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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