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Radeon HD 7870 XT vs Radeon R9 380 2G

Intro

The Radeon HD 7870 XT makes use of a 28 nm design. AMD has set the core speed at 925 MHz. The GDDR5 memory works at a frequency of 1500 MHz on this specific model. It features 1536 SPUs as well as 96 TAUs and 32 ROPs.

Compare that to the Radeon R9 380 2G, which uses a 28 nm design. AMD has clocked the core frequency at 970 MHz. The GDDR5 memory runs at a speed of 1425 MHz on this card. It features 1792 SPUs along with 112 Texture Address Units 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 380 2G 8850 points
Radeon HD 7870 XT 6390 points
Difference: 2460 (38%)

Ethereum Mining Hash Rate

Radeon R9 380 2G 19 Mh/s
Radeon HD 7870 XT 15 Mh/s
Difference: 4 (27%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT 185 Watts
Radeon R9 380 2G 190 Watts
Difference: 5 Watts (3%)

Memory Bandwidth

The Radeon HD 7870 XT, in theory, should perform a bit faster than the Radeon R9 380 2G overall. (explain)

Radeon HD 7870 XT 192000 MB/sec
Radeon R9 380 2G 182400 MB/sec
Difference: 9600 (5%)

Texel Rate

The Radeon R9 380 2G should be quite a bit (more or less 22%) better at AF than the Radeon HD 7870 XT. (explain)

Radeon R9 380 2G 108640 Mtexels/sec
Radeon HD 7870 XT 88800 Mtexels/sec
Difference: 19840 (22%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 380 2G is the winner, though only just barely. (explain)

Radeon R9 380 2G 31040 Mpixels/sec
Radeon HD 7870 XT 29600 Mpixels/sec
Difference: 1440 (5%)

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 XT

Amazon.com

Check prices at:

Radeon R9 380 2G

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 XT Radeon R9 380 2G
Manufacturer AMD AMD
Year November 2012 June 2015
Code Name Tahiti LE Antigua PRO
Memory 2048 MB 2048 MB
Core Speed 925 MHz 970 MHz
Memory Speed 6000 MHz 5700 MHz
Power (Max TDP) 185 watts 190 watts
Bandwidth 192000 MB/sec 182400 MB/sec
Texel Rate 88800 Mtexels/sec 108640 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 31040 Mpixels/sec
Unified Shaders 1536 1792
Texture Mapping Units 96 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 4313 million 5000 million
Bus PCIe 3.0 x16 PCIe 3.0 ×16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.5

Memory Bandwidth: Bandwidth is the largest amount of data (in units of MB per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 once 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, High Dynamic Range and higher screen resolutions.

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

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

Display Prices

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Radeon HD 7870 XT

Amazon.com

Check prices at:

Radeon R9 380 2G

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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