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Radeon HD 7870 vs Radeon R9 M390X

Intro

The Radeon HD 7870 features a GPU core speed of 1000 MHz, and the 2048 MB of GDDR5 RAM is set to run at 1200 MHz through a 256-bit bus. It also is comprised of 1280 Stream Processors, 80 Texture Address Units, and 32 ROPs.

Compare those specifications to the Radeon R9 M390X, which has a core clock speed of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X 125 Watts
Radeon HD 7870 175 Watts
Difference: 50 Watts (40%)

Memory Bandwidth

Theoretically, the Radeon R9 M390X should perform a little bit faster than the Radeon HD 7870 overall. (explain)

Radeon R9 M390X 160000 MB/sec
Radeon HD 7870 153600 MB/sec
Difference: 6400 (4%)

Texel Rate

The Radeon R9 M390X should be a small bit (more or less 16%) better at AF than the Radeon HD 7870. (explain)

Radeon R9 M390X 92544 Mtexels/sec
Radeon HD 7870 80000 Mtexels/sec
Difference: 12544 (16%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7870 is the winner, and very much so. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon R9 M390X 23136 Mpixels/sec
Difference: 8864 (38%)

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

Display Prices

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Radeon HD 7870

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 Radeon R9 M390X
Manufacturer AMD AMD
Year March 2012 2015
Code Name Pitcairn XT Tonga
Memory 2048 MB 4096 MB
Core Speed 1000 MHz 723 MHz
Memory Speed 4800 MHz 5000 MHz
Power (Max TDP) 175 watts 125 watts
Bandwidth 153600 MB/sec 160000 MB/sec
Texel Rate 80000 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 32000 Mpixels/sec 23136 Mpixels/sec
Unified Shaders 1280 2048
Texture Mapping Units 80 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 2800 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill 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 max fill rate.

Display Prices

Hide Prices

Radeon HD 7870

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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