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GeForce 820M vs Radeon HD 7950 3GB

Intro

The GeForce 820M comes with core speeds of 719 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 96 SPUs as well as 16 TAUs and 4 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7950 3GB, which features core speeds of 800 MHz on the GPU, and 1250 MHz on the 3072 MB of GDDR5 RAM. It features 1792 SPUs along with 112 Texture Address Units and 32 ROPs.

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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

As far as performance goes, the Radeon HD 7950 3GB should theoretically be a lot superior to 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 is quite a bit (more or less 679%) more effective at texture filtering than the GeForce 820M. (explain)

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

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7950 3GB is the winner, 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 (in units of MB per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once 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 anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number 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 is also dependant 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 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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