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GeForce 820M vs Radeon R9 M275X

Intro

The GeForce 820M features a clock speed of 719 MHz and a DDR3 memory frequency of 1000 MHz. It also makes use of a 64-bit memory bus, and makes use of a 28 nm design. It is made up of 96 SPUs, 16 TAUs, and 4 ROPs.

Compare those specs to the Radeon R9 M275X, which uses a 28 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 RAM runs at a frequency of 1125 MHz on this specific model. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

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, the Radeon R9 M275X should be quite a bit 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 will be quite a bit (approximately 213%) better 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 is quite a bit (about 401%) better at full screen anti-aliasing than the GeForce 820M, and 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: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster 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 are applied per second. This is calculated 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability 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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