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Radeon HD 7870 XT vs Radeon R9 M390X

Intro

The Radeon HD 7870 XT features core clock speeds of 925 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs as well as 96 TAUs and 32 ROPs.

Compare those specs to the Radeon R9 M390X, which makes use of a 28 nm design. AMD has clocked the core speed at 723 MHz. The GDDR5 RAM works at a frequency of 1250 MHz on this specific card. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X 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 M390X overall, due to its higher bandwidth. (explain)

Radeon HD 7870 XT 192000 MB/sec
Radeon R9 M390X 160000 MB/sec
Difference: 32000 (20%)

Texel Rate

The Radeon R9 M390X will be a bit (more or less 4%) more effective at AF than the Radeon HD 7870 XT. (explain)

Radeon R9 M390X 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 (approximately 28%) better at FSAA than the Radeon R9 M390X, and will be capable of handling higher screen resolutions better. (explain)

Radeon HD 7870 XT 29600 Mpixels/sec
Radeon R9 M390X 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 M390X

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 M390X
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 megabytes per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card 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 Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 7870 XT

Amazon.com

Check prices at:

Radeon R9 M390X

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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