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GeForce 820M vs Radeon HD 3470 256MB

Intro

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

Compare those specifications to the Radeon HD 3470 256MB, which uses a 55 nm design. AMD has clocked the core speed at 800 MHz. The DDR2 memory is set to run at a frequency of 950 MHz on this particular model. It features 40(8x5) SPUs as well as 4 Texture Address Units and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3470 256MB, in theory, should be a lot faster than the GeForce 820M in general. (explain)

Radeon HD 3470 256MB 30400 MB/sec
GeForce 820M 16000 MB/sec
Difference: 14400 (90%)

Texel Rate

The GeForce 820M should be a lot (more or less 260%) more effective at AF than the Radeon HD 3470 256MB. (explain)

GeForce 820M 11504 Mtexels/sec
Radeon HD 3470 256MB 3200 Mtexels/sec
Difference: 8304 (260%)

Pixel Rate

The Radeon HD 3470 256MB should be a bit (approximately 11%) better at full screen anti-aliasing than the GeForce 820M, and also should be capable of handling higher resolutions better. (explain)

Radeon HD 3470 256MB 3200 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 324 (11%)

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 3470 256MB

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 3470 256MB
Manufacturer nVidia AMD
Year February 2014 2008
Code Name GF117 RV620 PRO
Memory 2048 MB 256 MB
Core Speed 719 MHz 800 MHz
Memory Speed 2000 MHz 1900 MHz
Power (Max TDP) 15 watts (Unknown) watts
Bandwidth 16000 MB/sec 30400 MB/sec
Texel Rate 11504 Mtexels/sec 3200 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 3200 Mpixels/sec
Unified Shaders 96 40(8x5)
Texture Mapping Units 16 4
Render Output Units 4 4
Bus Type DDR3 DDR2
Bus Width 64-bit 128-bit
Fab Process 28 nm 55 nm
Transistors (Unknown) million (Unknown) 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 largest amount of information (in units of megabytes per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR 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 texture units of the card by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the 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 3470 256MB

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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