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Radeon HD 6870 vs Radeon R9 M395X

Intro

The Radeon HD 6870 features a GPU core clock speed of 900 MHz, and the 1024 MB of GDDR5 RAM is set to run at 1050 MHz through a 256-bit bus. It also is comprised of 1120 Stream Processors, 56 TAUs, and 32 Raster Operation Units.

Compare that to the Radeon R9 M395X, which makes use of a 28 nm design. AMD has clocked the core speed at 723 MHz. The GDDR5 RAM is set to run at a frequency of 1250 MHz on this particular model. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X 125 Watts
Radeon HD 6870 151 Watts
Difference: 26 Watts (21%)

Memory Bandwidth

The Radeon R9 M395X, in theory, should perform a bit faster than the Radeon HD 6870 in general. (explain)

Radeon R9 M395X 160000 MB/sec
Radeon HD 6870 134400 MB/sec
Difference: 25600 (19%)

Texel Rate

The Radeon R9 M395X is quite a bit (about 84%) more effective at texture filtering than the Radeon HD 6870. (explain)

Radeon R9 M395X 92544 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 42144 (84%)

Pixel Rate

The Radeon HD 6870 should be a lot (about 24%) more effective at full screen anti-aliasing than the Radeon R9 M395X, and also capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon R9 M395X 23136 Mpixels/sec
Difference: 5664 (24%)

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 M395X

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 M395X
Manufacturer AMD AMD
Year October 2010 2015
Code Name Barts XT Tonga
Memory 1024 MB 4096 MB
Core Speed 900 MHz 723 MHz
Memory Speed 4200 MHz 5000 MHz
Power (Max TDP) 151 watts 125 watts
Bandwidth 134400 MB/sec 160000 MB/sec
Texel Rate 50400 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 28800 Mpixels/sec 23136 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 (Unknown) million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 12
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of information (counted in MB per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total amount 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 6870

Amazon.com

Check prices at:

Radeon R9 M395X

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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