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Radeon HD 6870 vs Radeon R9 M395X

Intro

The Radeon HD 6870 comes with a clock frequency of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 256-bit bus, and makes use of a 40 nm design. It is made up of 1120 SPUs, 56 TAUs, and 32 ROPs.

Compare those specifications to the Radeon R9 M395X, which features a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also features 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation 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

Performance-wise, the Radeon R9 M395X should theoretically be a small bit superior to the Radeon HD 6870 overall. (explain)

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

Texel Rate

The Radeon R9 M395X is a lot (approximately 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 is a lot (more or less 24%) better at FSAA than the Radeon R9 M395X, and also should be capable of handling higher screen resolutions better. (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: Memory bandwidth is the largest amount of information (measured in MB per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling 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 the video card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential 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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