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GeForce GTX 870M vs Radeon R9 M280X

Intro

The GeForce GTX 870M makes use of a 28 nm design. nVidia has set the core speed at 941 MHz. The GDDR5 RAM runs at a frequency of 1000 MHz on this specific model. It features 1344 SPUs along with 112 Texture Address Units and 24 Rasterization Operator Units.

Compare those specifications to the Radeon R9 M280X, which has clock speeds of 900 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 memory. It features 896 SPUs as well as 56 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X 75 Watts
GeForce GTX 870M 110 Watts
Difference: 35 Watts (47%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 870M will be 9% faster than the Radeon R9 M280X overall, because of its higher bandwidth. (explain)

GeForce GTX 870M 96000 MB/sec
Radeon R9 M280X 88000 MB/sec
Difference: 8000 (9%)

Texel Rate

The GeForce GTX 870M will be much (approximately 109%) better at anisotropic filtering than the Radeon R9 M280X. (explain)

GeForce GTX 870M 105392 Mtexels/sec
Radeon R9 M280X 50400 Mtexels/sec
Difference: 54992 (109%)

Pixel Rate

The GeForce GTX 870M is much (more or less 57%) better at FSAA than the Radeon R9 M280X, and also able to handle higher resolutions better. (explain)

GeForce GTX 870M 22584 Mpixels/sec
Radeon R9 M280X 14400 Mpixels/sec
Difference: 8184 (57%)

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 GTX 870M

Amazon.com

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Radeon R9 M280X

Amazon.com

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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 GTX 870M Radeon R9 M280X
Manufacturer nVidia AMD
Year March 12 2014 Feb 9 2015
Code Name GK104 Saturn XT
Memory 3072 MB 4096 MB
Core Speed 941 MHz 900 MHz
Memory Speed 4000 MHz 5500 MHz
Power (Max TDP) 110 watts 75 watts
Bandwidth 96000 MB/sec 88000 MB/sec
Texel Rate 105392 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 22584 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 1344 896
Texture Mapping Units 112 56
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 128-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 3.0 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 max amount of information (measured in megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 once 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 amount of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total amount of texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce GTX 870M

Amazon.com

Check prices at:

Radeon R9 M280X

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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