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GeForce 920M vs Radeon HD 4870 2GB

Intro

The GeForce 920M uses a 28 nm design. nVidia has set the core frequency at 954 MHz. The DDR3 memory is set to run at a speed of 900 MHz on this specific model. It features 384 SPUs along with 32 TAUs and 8 Rasterization Operator Units.

Compare those specs to the Radeon HD 4870 2GB, which makes use of a 55 nm design. AMD has set the core speed at 750 MHz. The GDDR5 RAM is set to run at a speed of 900 MHz on this model. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 4870 2GB should in theory be quite a bit better than the GeForce 920M in general. (explain)

Radeon HD 4870 2GB 115200 MB/sec
GeForce 920M 14400 MB/sec
Difference: 100800 (700%)

Texel Rate

The GeForce 920M is a little bit (more or less 2%) better at anisotropic filtering than the Radeon HD 4870 2GB. (explain)

GeForce 920M 30528 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 528 (2%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4870 2GB is a better choice, by a large margin. (explain)

Radeon HD 4870 2GB 12000 Mpixels/sec
GeForce 920M 7632 Mpixels/sec
Difference: 4368 (57%)

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 920M

Amazon.com

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Radeon HD 4870 2GB

Amazon.com

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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 920M Radeon HD 4870 2GB
Manufacturer nVidia AMD
Year March 12 2015 Jun 25, 2008
Code Name GK208 RV770 XT
Memory 2048 MB 2048 MB
Core Speed 954 MHz 750 MHz
Memory Speed 1800 MHz 3600 MHz
Power (Max TDP) (Unknown) watts 150 watts
Bandwidth 14400 MB/sec 115200 MB/sec
Texel Rate 30528 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 7632 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 384 800(160x5)
Texture Mapping Units 32 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 956 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 max amount of information (in units of megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce 920M

Amazon.com

Check prices at:

Radeon HD 4870 2GB

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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