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GeForce 820M vs Radeon HD 4870 512MB

Intro

The GeForce 820M has a GPU clock speed of 719 MHz, and the 2048 MB of DDR3 RAM is set to run at 1000 MHz through a 64-bit bus. It also is made up of 96 SPUs, 16 TAUs, and 4 Raster Operation Units.

Compare that to the Radeon HD 4870 512MB, which comes with clock speeds of 750 MHz on the GPU, and 900 MHz on the 512 MB of GDDR5 RAM. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M 15 Watts
Radeon HD 4870 512MB 150 Watts
Difference: 135 Watts (900%)

Memory Bandwidth

In theory, the Radeon HD 4870 512MB is 620% faster than the GeForce 820M overall, due to its greater bandwidth. (explain)

Radeon HD 4870 512MB 115200 MB/sec
GeForce 820M 16000 MB/sec
Difference: 99200 (620%)

Texel Rate

The Radeon HD 4870 512MB will be quite a bit (approximately 161%) more effective at texture filtering than the GeForce 820M. (explain)

Radeon HD 4870 512MB 30000 Mtexels/sec
GeForce 820M 11504 Mtexels/sec
Difference: 18496 (161%)

Pixel Rate

The Radeon HD 4870 512MB should be a lot (more or less 317%) more effective at anti-aliasing than the GeForce 820M, and should be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 4870 512MB 12000 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 9124 (317%)

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 820M

Amazon.com

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Radeon HD 4870 512MB

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 820M Radeon HD 4870 512MB
Manufacturer nVidia AMD
Year February 2014 Jun 25, 2008
Code Name GF117 RV770 XT
Memory 2048 MB 512 MB
Core Speed 719 MHz 750 MHz
Memory Speed 2000 MHz 3600 MHz
Power (Max TDP) 15 watts 150 watts
Bandwidth 16000 MB/sec 115200 MB/sec
Texel Rate 11504 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 96 800(160x5)
Texture Mapping Units 16 40
Render Output Units 4 16
Bus Type DDR3 GDDR5
Bus Width 64-bit 256-bit
Fab Process 28 nm 55 nm
Transistors (Unknown) million 956 million
Bus PCIe 2.0 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 maximum amount of information (in units of MB per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. 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 in one second. This figure is worked out by multiplying the total texture units by the core 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 in a second.

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

Display Prices

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GeForce 820M

Amazon.com

Check prices at:

Radeon HD 4870 512MB

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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