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GeForce 820M vs Radeon HD 4870 1GB

Intro

The GeForce 820M has a GPU core speed of 719 MHz, and the 2048 MB of DDR3 memory runs at 1000 MHz through a 64-bit bus. It also is made up of 96 Stream Processors, 16 TAUs, and 4 Raster Operation Units.

Compare that to the Radeon HD 4870 1GB, which makes use of a 55 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 memory is set to run at a frequency of 900 MHz on this specific model. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M 15 Watts
Radeon HD 4870 1GB 150 Watts
Difference: 135 Watts (900%)

Memory Bandwidth

In theory, the Radeon HD 4870 1GB should be much faster than the GeForce 820M in general. (explain)

Radeon HD 4870 1GB 115200 MB/sec
GeForce 820M 16000 MB/sec
Difference: 99200 (620%)

Texel Rate

The Radeon HD 4870 1GB is quite a bit (about 161%) faster with regards to anisotropic filtering than the GeForce 820M. (explain)

Radeon HD 4870 1GB 30000 Mtexels/sec
GeForce 820M 11504 Mtexels/sec
Difference: 18496 (161%)

Pixel Rate

The Radeon HD 4870 1GB is much (approximately 317%) faster with regards to full screen anti-aliasing than the GeForce 820M, and should be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 4870 1GB 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

Check prices at:

Radeon HD 4870 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 820M Radeon HD 4870 1GB
Manufacturer nVidia AMD
Year February 2014 Jun 25, 2008
Code Name GF117 RV770 XT
Memory 2048 MB 1024 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 largest amount of data (in units of MB per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce 820M

Amazon.com

Check prices at:

Radeon HD 4870 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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