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Radeon HD 7870 vs Radeon R9 M390X

Intro

The Radeon HD 7870 uses a 28 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 RAM runs at a speed of 1200 MHz on this specific card. It features 1280 SPUs along with 80 TAUs and 32 ROPs.

Compare those specs to the Radeon R9 M390X, which uses a 28 nm design. AMD has clocked the core frequency at 723 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this specific model. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator 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

The Radeon R9 M390X should theoretically be a small 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 bit (approximately 16%) more effective at anisotropic filtering than the Radeon HD 7870. (explain)

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

Pixel Rate

The Radeon HD 7870 should be a lot (approximately 38%) faster with regards to anti-aliasing than the Radeon R9 M390X, and also will be capable of handling higher resolutions while still performing well. (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

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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 maximum amount of information (measured in MB per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. 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 can be processed per second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics 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 Render Output Units by the the card's clock speed. 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 lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to 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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