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Radeon HD 7870 XT vs Radeon R9 380 4G

Intro

The Radeon HD 7870 XT features a GPU core clock speed of 925 MHz, and the 2048 MB of GDDR5 RAM is set to run at 1500 MHz through a 256-bit bus. It also is comprised of 1536 Stream Processors, 96 Texture Address Units, and 32 Raster Operation Units.

Compare all of that to the Radeon R9 380 4G, which features GPU core speed of 970 MHz, and 4096 MB of GDDR5 RAM running at 1425 MHz through a 256-bit bus. It also features 1792 SPUs, 112 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 380 4G 8837 points
Radeon HD 7870 XT 6390 points
Difference: 2447 (38%)

Ethereum Mining Hash Rate

Radeon R9 380 4G 21 Mh/s
Radeon HD 7870 XT 15 Mh/s
Difference: 6 (40%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT 185 Watts
Radeon R9 380 4G 190 Watts
Difference: 5 Watts (3%)

Memory Bandwidth

The Radeon HD 7870 XT should theoretically perform just a bit faster than the Radeon R9 380 4G in general. (explain)

Radeon HD 7870 XT 192000 MB/sec
Radeon R9 380 4G 182400 MB/sec
Difference: 9600 (5%)

Texel Rate

The Radeon R9 380 4G should be quite a bit (about 22%) more effective at AF than the Radeon HD 7870 XT. (explain)

Radeon R9 380 4G 108640 Mtexels/sec
Radeon HD 7870 XT 88800 Mtexels/sec
Difference: 19840 (22%)

Pixel Rate

The Radeon R9 380 4G is a little bit (approximately 5%) faster with regards to full screen anti-aliasing than the Radeon HD 7870 XT, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 380 4G 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 4G

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 4G
Manufacturer AMD AMD
Year November 2012 June 2015
Code Name Tahiti LE Antigua PRO
Memory 2048 MB 4096 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 max amount of data (in units of MB per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's 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 number of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated 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 also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 7870 XT

Amazon.com

Check prices at:

Radeon R9 380 4G

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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