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GeForce 820M vs Radeon R9 M275X

Intro

The GeForce 820M has clock speeds of 719 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 96 SPUs as well as 16 Texture Address Units and 4 ROPs.

Compare all that to the Radeon R9 M275X, which features core speeds of 900 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 RAM. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M 15 Watts
Radeon R9 M275X 50 Watts
Difference: 35 Watts (233%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M275X should be much faster than the GeForce 820M overall. (explain)

Radeon R9 M275X 72000 MB/sec
GeForce 820M 16000 MB/sec
Difference: 56000 (350%)

Texel Rate

The Radeon R9 M275X will be much (approximately 213%) faster with regards to anisotropic filtering than the GeForce 820M. (explain)

Radeon R9 M275X 36000 Mtexels/sec
GeForce 820M 11504 Mtexels/sec
Difference: 24496 (213%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 M275X is the winner, and very much so. (explain)

Radeon R9 M275X 14400 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 11524 (401%)

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 R9 M275X

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 R9 M275X
Manufacturer nVidia AMD
Year February 2014 May 1 2014
Code Name GF117 Venus XTX
Memory 2048 MB 2048 MB
Core Speed 719 MHz 900 MHz
Memory Speed 2000 MHz 4500 MHz
Power (Max TDP) 15 watts 50 watts
Bandwidth 16000 MB/sec 72000 MB/sec
Texel Rate 11504 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 96 640
Texture Mapping Units 16 40
Render Output Units 4 16
Bus Type DDR3 GDDR5
Bus Width 64-bit 128-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12 DirectX 11.2
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of data (in units of MB per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount 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 drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

GeForce 820M

Amazon.com

Check prices at:

Radeon R9 M275X

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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