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Radeon HD 7870 XT vs Radeon R9 M395X

Intro

The Radeon HD 7870 XT features clock speeds of 925 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs along with 96 Texture Address Units and 32 Rasterization Operator Units.

Compare those specifications to the Radeon R9 M395X, which comes with a core clock frequency of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 256-bit memory bus, and uses a 28 nm design. It features 2048 SPUs, 128 TAUs, and 32 ROPs.

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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

Performance-wise, the Radeon HD 7870 XT should theoretically be a bit superior to the Radeon R9 M395X in general. (explain)

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

Texel Rate

The Radeon R9 M395X is a small bit (about 4%) better at texture 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

If running with lots of anti-aliasing is important to you, then the Radeon HD 7870 XT is a better choice, by a large margin. (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 largest amount of data (in units of MB per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a 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. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach 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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