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GeForce 820M vs Radeon HD 4890 2GB

Intro

The GeForce 820M has a GPU core speed of 719 MHz, and the 2048 MB of DDR3 RAM runs at 1000 MHz through a 64-bit bus. It also is comprised of 96 SPUs, 16 Texture Address Units, and 4 ROPs.

Compare all that to the Radeon HD 4890 2GB, which makes use of a 55 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 memory runs at a frequency of 975 MHz on this specific model. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M 15 Watts
Radeon HD 4890 2GB 190 Watts
Difference: 175 Watts (1167%)

Memory Bandwidth

The Radeon HD 4890 2GB, in theory, should perform much faster than the GeForce 820M in general. (explain)

Radeon HD 4890 2GB 124800 MB/sec
GeForce 820M 16000 MB/sec
Difference: 108800 (680%)

Texel Rate

The Radeon HD 4890 2GB will be much (approximately 248%) better at texture filtering than the GeForce 820M. (explain)

Radeon HD 4890 2GB 40000 Mtexels/sec
GeForce 820M 11504 Mtexels/sec
Difference: 28496 (248%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4890 2GB is superior to the GeForce 820M, by a large margin. (explain)

Radeon HD 4890 2GB 16000 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 13124 (456%)

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 4890 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.

Specifications

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Model GeForce 820M Radeon HD 4890 2GB
Manufacturer nVidia AMD
Year February 2014 Apr 2, 2009
Code Name GF117 RV790 XT
Memory 2048 MB 2048 MB
Core Speed 719 MHz 1000 MHz
Memory Speed 2000 MHz 3900 MHz
Power (Max TDP) 15 watts 190 watts
Bandwidth 16000 MB/sec 124800 MB/sec
Texel Rate 11504 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 16000 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 959 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 (measured in MB per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends 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 maximum fill rate.

Display Prices

Hide Prices

GeForce 820M

Amazon.com

Check prices at:

Radeon HD 4890 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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