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Radeon HD 7870 XT vs Radeon R9 M290X

Intro

The Radeon HD 7870 XT comes with a GPU core speed of 925 MHz, and the 2048 MB of GDDR5 memory runs at 1500 MHz through a 256-bit bus. It also is made up of 1536 SPUs, 96 TAUs, and 32 ROPs.

Compare all that to the Radeon R9 M290X, which comes with core speeds of 850 MHz on the GPU, and 1200 MHz on the 4096 MB of GDDR5 RAM. It features 1280 SPUs as well as 80 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M290X 100 Watts
Radeon HD 7870 XT 185 Watts
Difference: 85 Watts (85%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 XT should be 25% quicker than the Radeon R9 M290X overall, because of its greater data rate. (explain)

Radeon HD 7870 XT 192000 MB/sec
Radeon R9 M290X 153600 MB/sec
Difference: 38400 (25%)

Texel Rate

The Radeon HD 7870 XT is quite a bit (more or less 31%) faster with regards to texture filtering than the Radeon R9 M290X. (explain)

Radeon HD 7870 XT 88800 Mtexels/sec
Radeon R9 M290X 68000 Mtexels/sec
Difference: 20800 (31%)

Pixel Rate

The Radeon HD 7870 XT will be a little bit (more or less 9%) better at anti-aliasing than the Radeon R9 M290X, and also will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7870 XT 29600 Mpixels/sec
Radeon R9 M290X 27200 Mpixels/sec
Difference: 2400 (9%)

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 M290X

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 M290X
Manufacturer AMD AMD
Year November 2012 May 1 2014
Code Name Tahiti LE Neptune XT
Memory 2048 MB 4096 MB
Core Speed 925 MHz 850 MHz
Memory Speed 6000 MHz 4800 MHz
Power (Max TDP) 185 watts 100 watts
Bandwidth 192000 MB/sec 153600 MB/sec
Texel Rate 88800 Mtexels/sec 68000 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 27200 Mpixels/sec
Unified Shaders 1536 1280
Texture Mapping Units 96 80
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 11.2
OpenGL Version OpenGL 4.3 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 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 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 calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 7870 XT

Amazon.com

Check prices at:

Radeon R9 M290X

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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