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Radeon HD 7870 XT vs Radeon R9 M395X

Intro

The Radeon HD 7870 XT makes use of a 28 nm design. AMD has clocked the core speed at 925 MHz. The GDDR5 memory runs at a frequency of 1500 MHz on this particular model. It features 1536 SPUs along with 96 TAUs and 32 ROPs.

Compare those specifications to the Radeon R9 M395X, which makes use of a 28 nm design. AMD has clocked the core speed at 723 MHz. The GDDR5 memory works at a speed of 1250 MHz on this specific model. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X 125 Watts
Radeon HD 7870 XT 185 Watts
Difference: 60 Watts (48%)

Memory Bandwidth

The Radeon HD 7870 XT should theoretically be a bit faster than the Radeon R9 M395X overall. (explain)

Radeon HD 7870 XT 192000 MB/sec
Radeon R9 M395X 160000 MB/sec
Difference: 32000 (20%)

Texel Rate

The Radeon R9 M395X should be a bit (about 4%) faster with regards to anisotropic filtering than the Radeon HD 7870 XT. (explain)

Radeon R9 M395X 92544 Mtexels/sec
Radeon HD 7870 XT 88800 Mtexels/sec
Difference: 3744 (4%)

Pixel Rate

The Radeon HD 7870 XT is quite a bit (more or less 28%) better at AA than the Radeon R9 M395X, and also will be able to handle higher resolutions more effectively. (explain)

Radeon HD 7870 XT 29600 Mpixels/sec
Radeon R9 M395X 23136 Mpixels/sec
Difference: 6464 (28%)

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 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 7870 XT Radeon R9 M395X
Manufacturer AMD AMD
Year November 2012 2015
Code Name Tahiti LE Tonga
Memory 2048 MB 4096 MB
Core Speed 925 MHz 723 MHz
Memory Speed 6000 MHz 5000 MHz
Power (Max TDP) 185 watts 125 watts
Bandwidth 192000 MB/sec 160000 MB/sec
Texel Rate 88800 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 23136 Mpixels/sec
Unified Shaders 1536 2048
Texture Mapping Units 96 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 4313 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12
OpenGL Version OpenGL 4.3 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in MB per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, 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 most pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the clock speed of the card. 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 - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 7870 XT

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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