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GeForce 820M vs Radeon HD 7950 3GB

Intro

The GeForce 820M comes with a core clock speed of 719 MHz and a DDR3 memory speed of 1000 MHz. It also makes use of a 64-bit memory bus, and uses a 28 nm design. It is comprised of 96 SPUs, 16 Texture Address Units, and 4 Raster Operation Units.

Compare those specifications to the Radeon HD 7950 3GB, which makes use of a 28 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 RAM runs at a frequency of 1250 MHz on this model. It features 1792 SPUs along with 112 Texture Address Units 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

In theory, the Radeon HD 7950 3GB should perform quite a bit 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 is quite a bit (approximately 679%) faster with regards to AF than the GeForce 820M. (explain)

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

Pixel Rate

The Radeon HD 7950 3GB will be quite a bit (about 790%) faster with regards to FSAA than the GeForce 820M, and also will be able to handle higher resolutions without losing too much performance. (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 max amount of data (in units of MB per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka 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 bandwidth is, the lower the potential to get to the maximum 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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