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Radeon HD 5870 vs Radeon HD 7870 XT

Intro

The Radeon HD 5870 has core speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 RAM. It features 1600(320x5) SPUs along with 80 Texture Address Units and 32 ROPs.

Compare those specifications to the Radeon HD 7870 XT, which has a core clock speed of 925 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 1536 SPUs, 96 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT 185 Watts
Radeon HD 5870 188 Watts
Difference: 3 Watts (2%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7870 XT should theoretically be a lot superior to the Radeon HD 5870 in general. (explain)

Radeon HD 7870 XT 192000 MB/sec
Radeon HD 5870 153600 MB/sec
Difference: 38400 (25%)

Texel Rate

The Radeon HD 7870 XT will be a lot (about 31%) better at anisotropic filtering than the Radeon HD 5870. (explain)

Radeon HD 7870 XT 88800 Mtexels/sec
Radeon HD 5870 68000 Mtexels/sec
Difference: 20800 (31%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7870 XT is the winner, not by a very large margin though. (explain)

Radeon HD 7870 XT 29600 Mpixels/sec
Radeon HD 5870 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 5870

Amazon.com

Check prices at:

Radeon HD 7870 XT

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 5870 Radeon HD 7870 XT
Manufacturer AMD AMD
Year September 23, 2009 November 2012
Code Name Cypress XT Tahiti LE
Memory 1024 MB 2048 MB
Core Speed 850 MHz 925 MHz
Memory Speed 4800 MHz 6000 MHz
Power (Max TDP) 188 watts 185 watts
Bandwidth 153600 MB/sec 192000 MB/sec
Texel Rate 68000 Mtexels/sec 88800 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 1600(320x5) 1536
Texture Mapping Units 80 96
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 2154 million 4313 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 3.2 OpenGL 4.3

Memory Bandwidth: Bandwidth is the largest amount of information (counted in MB per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core 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 is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 5870

Amazon.com

Check prices at:

Radeon HD 7870 XT

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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