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GeForce 820M vs Radeon HD 3870 512MB

Intro

The GeForce 820M uses a 28 nm design. nVidia has clocked the core frequency at 719 MHz. The DDR3 RAM is set to run at a speed of 1000 MHz on this particular model. It features 96 SPUs as well as 16 Texture Address Units and 4 ROPs.

Compare all of that to the Radeon HD 3870 512MB, which uses a 55 nm design. AMD has set the core frequency at 775 MHz. The GDDR3 RAM works at a frequency of 900 MHz on this particular card. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M 15 Watts
Radeon HD 3870 512MB 106 Watts
Difference: 91 Watts (607%)

Memory Bandwidth

As far as performance goes, the Radeon HD 3870 512MB should in theory be quite a bit better than the GeForce 820M in general. (explain)

Radeon HD 3870 512MB 57600 MB/sec
GeForce 820M 16000 MB/sec
Difference: 41600 (260%)

Texel Rate

The Radeon HD 3870 512MB is a small bit (more or less 8%) faster with regards to AF than the GeForce 820M. (explain)

Radeon HD 3870 512MB 12400 Mtexels/sec
GeForce 820M 11504 Mtexels/sec
Difference: 896 (8%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 3870 512MB is a better choice, by a large margin. (explain)

Radeon HD 3870 512MB 12400 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 9524 (331%)

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 3870 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 3870 512MB
Manufacturer nVidia AMD
Year February 2014 Nov 19, 2007
Code Name GF117 RV670 XT
Memory 2048 MB 512 MB
Core Speed 719 MHz 775 MHz
Memory Speed 2000 MHz 1800 MHz
Power (Max TDP) 15 watts 106 watts
Bandwidth 16000 MB/sec 57600 MB/sec
Texel Rate 11504 Mtexels/sec 12400 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 12400 Mpixels/sec
Unified Shaders 96 320(64x5)
Texture Mapping Units 16 16
Render Output Units 4 16
Bus Type DDR3 GDDR3
Bus Width 64-bit 256-bit
Fab Process 28 nm 55 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16 PCIe 2.0 x16/AGP 8x
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 (counted in megabytes per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 are processed per second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

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

Display Prices

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GeForce 820M

Amazon.com

Check prices at:

Radeon HD 3870 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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