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GeForce 820M vs Radeon R5 M255

Intro

The GeForce 820M has a clock speed of 719 MHz and a DDR3 memory speed 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 that to the Radeon R5 M255, which comes with a clock frequency of 940 MHz and a DDR3 memory frequency of 1000 MHz. It also makes use of a 64-bit memory bus, and uses a 28 nm design. It features 320 SPUs, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Both cards have exactly the same bandwidth, so in theory they should perform exactly the same. (explain)

Texel Rate

The Radeon R5 M255 is a lot (approximately 63%) better at AF than the GeForce 820M. (explain)

Radeon R5 M255 18800 Mtexels/sec
GeForce 820M 11504 Mtexels/sec
Difference: 7296 (63%)

Pixel Rate

The Radeon R5 M255 should be a lot (about 161%) faster with regards to FSAA than the GeForce 820M, and also will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon R5 M255 7520 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 4644 (161%)

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 R5 M255

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 R5 M255
Manufacturer nVidia AMD
Year February 2014 June 2014
Code Name GF117 Jet Pro
Memory 2048 MB 2048 MB
Core Speed 719 MHz 940 MHz
Memory Speed 2000 MHz 2000 MHz
Power (Max TDP) 15 watts (Unknown) watts
Bandwidth 16000 MB/sec 16000 MB/sec
Texel Rate 11504 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 96 320
Texture Mapping Units 16 20
Render Output Units 4 8
Bus Type DDR3 DDR3
Bus Width 64-bit 64-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16 PCIe 3.0 x8
DirectX Version DirectX 12 DirectX 11.2
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of information (counted in megabytes per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, 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 calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce 820M

Amazon.com

Check prices at:

Radeon R5 M255

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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