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GeForce 820M vs Radeon HD 4890 2GB

Intro

The GeForce 820M makes use of a 28 nm design. nVidia has set the core frequency at 719 MHz. The DDR3 RAM works at a frequency of 1000 MHz on this particular card. It features 96 SPUs as well as 16 TAUs and 4 ROPs.

Compare those specifications to the Radeon HD 4890 2GB, which features a core clock speed of 1000 MHz and a GDDR5 memory frequency of 975 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 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 4890 2GB 190 Watts
Difference: 175 Watts (1167%)

Memory Bandwidth

In theory, the Radeon HD 4890 2GB is 680% quicker than the GeForce 820M in general, due to its higher data rate. (explain)

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

Texel Rate

The Radeon HD 4890 2GB should be much (approximately 248%) better at AF 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 a better choice, and very much so. (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: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This number is calculated 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant 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 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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