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Radeon HD 7870 XT vs Radeon R9 M390X

Intro

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

Compare those specs to the Radeon R9 M390X, which comes with core clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 TAUs and 32 Rasterization Operator Units.

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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

Theoretically speaking, the Radeon HD 7870 XT will be 20% quicker than the Radeon R9 M390X overall, because of its higher data rate. (explain)

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

Texel Rate

The Radeon R9 M390X should be a small bit (about 4%) more effective at texture filtering 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 a lot (more or less 28%) more effective at AA than the Radeon R9 M390X, and should be able to handle 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 maximum amount of information (counted in MB per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 applied per second. This 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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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.

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