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GeForce GTX 870M vs Radeon R9 M380

Intro

The GeForce GTX 870M has a core clock speed of 941 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 192-bit bus, and uses a 28 nm design. It is comprised of 1344 SPUs, 112 Texture Address Units, and 24 Raster Operation Units.

Compare all of that to the Radeon R9 M380, which has core speeds of 1000 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 memory. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

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 have the same performance. (explain)

Texel Rate

The GeForce GTX 870M is a lot (about 163%) more effective at AF than the Radeon R9 M380. (explain)

GeForce GTX 870M 105392 Mtexels/sec
Radeon R9 M380 40000 Mtexels/sec
Difference: 65392 (163%)

Pixel Rate

The GeForce GTX 870M is a lot (approximately 41%) more effective at full screen anti-aliasing than the Radeon R9 M380, and also should be capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 870M 22584 Mpixels/sec
Radeon R9 M380 16000 Mpixels/sec
Difference: 6584 (41%)

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 M380

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 GTX 870M Radeon R9 M380
Manufacturer nVidia AMD
Year March 12 2014 2015
Code Name GK104 Cape Verde
Memory 3072 MB 4096 MB
Core Speed 941 MHz 1000 MHz
Memory Speed 4000 MHz 6000 MHz
Power (Max TDP) 110 watts (Unknown) watts
Bandwidth 96000 MB/sec 96000 MB/sec
Texel Rate 105392 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 22584 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 1344 640
Texture Mapping Units 112 40
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 12
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it must 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of 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 output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce GTX 870M

Amazon.com

Check prices at:

Radeon R9 M380

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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