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Radeon HD 7870 XT vs Radeon R9 M395X

Intro

The Radeon HD 7870 XT has a core clock speed of 925 MHz and a GDDR5 memory frequency of 1500 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It features 1536 SPUs, 96 TAUs, and 32 ROPs.

Compare those specs to the Radeon R9 M395X, which makes use of a 28 nm design. AMD has set the core frequency at 723 MHz. The GDDR5 memory runs at a speed of 1250 MHz on this particular model. It features 2048 SPUs along with 128 Texture Address Units 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

In theory, the Radeon HD 7870 XT is 20% faster than the Radeon R9 M395X in general, due to its higher bandwidth. (explain)

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

Texel Rate

The Radeon R9 M395X is just a bit (approximately 4%) better at AF 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 will be quite a bit (more or less 28%) more effective at FSAA than the Radeon R9 M395X, and also will be capable of handling higher screen resolutions while still performing well. (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: Bandwidth is the largest amount of data (in units of MB per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 applied per second. This number 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 video 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 the video card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output 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

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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.

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