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Radeon HD 6870 vs Radeon R9 380X

Intro

The Radeon HD 6870 comes with core speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 1120 SPUs along with 56 TAUs and 32 Rasterization Operator Units.

Compare all of that to the Radeon R9 380X, which features clock speeds of 970 MHz on the GPU, and 1425 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

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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

In theory, the Radeon R9 380X should be 36% faster than the Radeon HD 6870 in general, due to its greater data rate. (explain)

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

Texel Rate

The Radeon R9 380X will be a lot (approximately 146%) more effective at texture 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 running with lots of anti-aliasing is important to you, then the Radeon R9 380X is a better choice, but not by far. (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

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.

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 megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. 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 amount of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video 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 maximum amount of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock speed of the card. 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 lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum 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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