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Radeon R9 380X vs Radeon R9 M275X

Intro

The Radeon R9 380X uses a 28 nm design. AMD has set the core speed at 970 MHz. The GDDR5 RAM is set to run at a speed of 1425 MHz on this card. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

Compare all of that to the Radeon R9 M275X, which makes use of a 28 nm design. AMD has set the core speed at 900 MHz. The GDDR5 memory is set to run at a speed of 1125 MHz on this model. It features 640 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X 50 Watts
Radeon R9 380X 190 Watts
Difference: 140 Watts (280%)

Memory Bandwidth

Performance-wise, the Radeon R9 380X should in theory be much superior to the Radeon R9 M275X in general. (explain)

Radeon R9 380X 182400 MB/sec
Radeon R9 M275X 72000 MB/sec
Difference: 110400 (153%)

Texel Rate

The Radeon R9 380X should be much (more or less 245%) better at anisotropic filtering than the Radeon R9 M275X. (explain)

Radeon R9 380X 124160 Mtexels/sec
Radeon R9 M275X 36000 Mtexels/sec
Difference: 88160 (245%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 380X is superior to the Radeon R9 M275X, by a large margin. (explain)

Radeon R9 380X 31040 Mpixels/sec
Radeon R9 M275X 14400 Mpixels/sec
Difference: 16640 (116%)

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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Radeon R9 380X

Amazon.com

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Radeon R9 M275X

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 Radeon R9 380X Radeon R9 M275X
Manufacturer AMD AMD
Year November 2015 May 1 2014
Code Name Tonga XT Venus XTX
Memory 4096 MB 2048 MB
Core Speed 970 MHz 900 MHz
Memory Speed 5700 MHz 4500 MHz
Power (Max TDP) 190 watts 50 watts
Bandwidth 182400 MB/sec 72000 MB/sec
Texel Rate 124160 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 31040 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 2048 640
Texture Mapping Units 128 40
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 28 nm 28 nm
Transistors 5000 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12.0 DirectX 11.2
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of information (counted in megabytes per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon R9 380X

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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