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Radeon HD 7870 vs Radeon R9 380X

Intro

The Radeon HD 7870 comes with a GPU core speed of 1000 MHz, and the 2048 MB of GDDR5 memory is set to run at 1200 MHz through a 256-bit bus. It also is made up of 1280 SPUs, 80 Texture Address Units, and 32 ROPs.

Compare those specifications to the Radeon R9 380X, which has clock speeds of 970 MHz on the GPU, and 1425 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon R9 380X 9519 points
Radeon HD 7870 6230 points
Difference: 3289 (53%)

Ethereum Mining Hash Rate

Radeon R9 380X 19 Mh/s
Radeon HD 7870 16 Mh/s
Difference: 3 (19%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 175 Watts
Radeon R9 380X 190 Watts
Difference: 15 Watts (9%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 380X should be 19% quicker than the Radeon HD 7870 in general, due to its higher bandwidth. (explain)

Radeon R9 380X 182400 MB/sec
Radeon HD 7870 153600 MB/sec
Difference: 28800 (19%)

Texel Rate

The Radeon R9 380X will be a lot (more or less 55%) faster with regards to AF than the Radeon HD 7870. (explain)

Radeon R9 380X 124160 Mtexels/sec
Radeon HD 7870 80000 Mtexels/sec
Difference: 44160 (55%)

Pixel Rate

The Radeon HD 7870 should be a little bit (about 3%) more effective at full screen anti-aliasing than the Radeon R9 380X, and also able to handle higher resolutions better. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon R9 380X 31040 Mpixels/sec
Difference: 960 (3%)

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 HD 7870

Amazon.com

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Radeon R9 380X

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 Radeon HD 7870 Radeon R9 380X
Manufacturer AMD AMD
Year March 2012 November 2015
Code Name Pitcairn XT Tonga XT
Memory 2048 MB 4096 MB
Core Speed 1000 MHz 970 MHz
Memory Speed 4800 MHz 5700 MHz
Power (Max TDP) 175 watts 190 watts
Bandwidth 153600 MB/sec 182400 MB/sec
Texel Rate 80000 Mtexels/sec 124160 Mtexels/sec
Pixel Rate 32000 Mpixels/sec 31040 Mpixels/sec
Unified Shaders 1280 2048
Texture Mapping Units 80 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 2800 million 5000 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.2 OpenGL 4.5

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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

Display Prices

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Radeon HD 7870

Amazon.com

Check prices at:

Radeon R9 380X

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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