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GeForce 820M vs Radeon HD 7950

Intro

The GeForce 820M features a GPU clock speed of 719 MHz, and the 2048 MB of DDR3 RAM runs at 1000 MHz through a 64-bit bus. It also is made up of 96 Stream Processors, 16 Texture Address Units, and 4 ROPs.

Compare those specifications to the Radeon HD 7950, which makes use of a 28 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this specific card. It features 1792 SPUs along with 112 TAUs and 32 Rasterization Operator Units.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7950 7731 points
GeForce 820M 850 points
Difference: 6881 (810%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Performance-wise, the Radeon HD 7950 should in theory be much superior to the GeForce 820M in general. (explain)

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

Texel Rate

The Radeon HD 7950 will be a lot (more or less 679%) faster with regards to texture filtering than the GeForce 820M. (explain)

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

Pixel Rate

The Radeon HD 7950 is quite a bit (more or less 790%) faster with regards to full screen anti-aliasing than the GeForce 820M, and also will be able to handle higher screen resolutions better. (explain)

Radeon HD 7950 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

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Radeon HD 7950

Amazon.com

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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
Manufacturer nVidia AMD
Year February 2014 January 2012
Code Name GF117 Tahiti Pro
Memory 2048 MB 1536 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 (measured in megabytes per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 820M

Amazon.com

Check prices at:

Radeon HD 7950

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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