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GeForce 820M vs Radeon HD 7950 3GB

Intro

The GeForce 820M has a clock speed of 719 MHz and a DDR3 memory frequency of 1000 MHz. It also features a 64-bit bus, and uses a 28 nm design. It features 96 SPUs, 16 Texture Address Units, and 4 ROPs.

Compare those specs to the Radeon HD 7950 3GB, which makes use of a 28 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 memory runs at a frequency of 1250 MHz on this particular model. It features 1792 SPUs along with 112 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M 15 Watts
Radeon HD 7950 3GB 200 Watts
Difference: 185 Watts (1233%)

Memory Bandwidth

The Radeon HD 7950 3GB should in theory be much faster than the GeForce 820M in general. (explain)

Radeon HD 7950 3GB 240000 MB/sec
GeForce 820M 16000 MB/sec
Difference: 224000 (1400%)

Texel Rate

The Radeon HD 7950 3GB will be much (more or less 679%) more effective at anisotropic filtering than the GeForce 820M. (explain)

Radeon HD 7950 3GB 89600 Mtexels/sec
GeForce 820M 11504 Mtexels/sec
Difference: 78096 (679%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7950 3GB is a better choice, by far. (explain)

Radeon HD 7950 3GB 25600 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 22724 (790%)

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 7950 3GB

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 7950 3GB
Manufacturer nVidia AMD
Year February 2014 January 2012
Code Name GF117 Tahiti Pro
Memory 2048 MB 3072 MB
Core Speed 719 MHz 800 MHz
Memory Speed 2000 MHz 5000 MHz
Power (Max TDP) 15 watts 200 watts
Bandwidth 16000 MB/sec 240000 MB/sec
Texel Rate 11504 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 96 1792
Texture Mapping Units 16 112
Render Output Units 4 32
Bus Type DDR3 GDDR5
Bus Width 64-bit 384-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million 4313 million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12 DirectX 11.1
OpenGL Version OpenGL 4.5 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the 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 per second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units 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 rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce 820M

Amazon.com

Check prices at:

Radeon HD 7950 3GB

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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