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Radeon HD 7870 XT vs Radeon R9 M290X

Intro

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

Compare those specifications to the Radeon R9 M290X, which makes use of a 28 nm design. AMD has clocked the core speed at 850 MHz. The GDDR5 memory runs at a frequency of 1200 MHz on this particular model. It features 1280 SPUs along with 80 TAUs and 32 ROPs.

Display Graphs

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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

In theory, the Radeon HD 7870 XT should be much faster than the Radeon R9 M290X in general. (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 much (approximately 31%) more effective at AF 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 small bit (approximately 9%) better at anti-aliasing than the Radeon R9 M290X, and should be capable of handling higher resolutions while still performing well. (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 largest amount of information (measured in megabytes per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to 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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