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GeForce 820M vs Radeon R9 M275X

Intro

The GeForce 820M uses a 28 nm design. nVidia has clocked the core frequency at 719 MHz. The DDR3 memory is set to run at a speed of 1000 MHz on this card. It features 96 SPUs as well as 16 Texture Address Units and 4 ROPs.

Compare those specifications to the Radeon R9 M275X, which has a GPU core clock speed of 900 MHz, and 2048 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 TAUs, 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

The Radeon R9 M275X should in theory be a lot faster than the GeForce 820M in general. (explain)

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

Texel Rate

The Radeon R9 M275X should be a lot (about 213%) more effective at AF than the GeForce 820M. (explain)

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

Pixel Rate

The Radeon R9 M275X will be quite a bit (about 401%) more effective at FSAA than the GeForce 820M, and also will be capable of handling higher screen resolutions without slowing down too much. (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 largest amount of data (measured in MB per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is calculated 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 processed in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory per 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 - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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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.

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