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Radeon HD 6870 vs Radeon R9 380X

Intro

The Radeon HD 6870 features a GPU core clock speed of 900 MHz, and the 1024 MB of GDDR5 memory runs at 1050 MHz through a 256-bit bus. It also is comprised of 1120 SPUs, 56 TAUs, and 32 ROPs.

Compare all that to the Radeon R9 380X, which comes with a clock frequency of 970 MHz and a GDDR5 memory frequency of 1425 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 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 6870 2870 points
Difference: 6649 (232%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6870 151 Watts
Radeon R9 380X 190 Watts
Difference: 39 Watts (26%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 380X is 36% faster than the Radeon HD 6870 overall, due to its greater bandwidth. (explain)

Radeon R9 380X 182400 MB/sec
Radeon HD 6870 134400 MB/sec
Difference: 48000 (36%)

Texel Rate

The Radeon R9 380X should be much (approximately 146%) more effective at anisotropic filtering than the Radeon HD 6870. (explain)

Radeon R9 380X 124160 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 73760 (146%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 380X is the winner, though only just barely. (explain)

Radeon R9 380X 31040 Mpixels/sec
Radeon HD 6870 28800 Mpixels/sec
Difference: 2240 (8%)

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 6870

Amazon.com

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Radeon R9 380X

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 HD 6870 Radeon R9 380X
Manufacturer AMD AMD
Year October 2010 November 2015
Code Name Barts XT Tonga XT
Memory 1024 MB 4096 MB
Core Speed 900 MHz 970 MHz
Memory Speed 4200 MHz 5700 MHz
Power (Max TDP) 151 watts 190 watts
Bandwidth 134400 MB/sec 182400 MB/sec
Texel Rate 50400 Mtexels/sec 124160 Mtexels/sec
Pixel Rate 28800 Mpixels/sec 31040 Mpixels/sec
Unified Shaders 1120 2048
Texture Mapping Units 56 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 1700 million 5000 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 12.0
OpenGL Version OpenGL 4.1 OpenGL 4.5

Memory Bandwidth: Bandwidth is the max amount of information (counted in MB per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 are applied in one second. This figure is worked out by multiplying the total texture units of the card 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 applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount 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 output rate also depends on many other factors, most notably 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 6870

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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