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Radeon HD 7870 vs Radeon HD 7870 XT

Intro

The Radeon HD 7870 uses a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory runs at a speed of 1200 MHz on this card. It features 1280 SPUs as well as 80 TAUs and 32 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7870 XT, which features a GPU core clock speed of 925 MHz, and 2048 MB of GDDR5 memory running at 1500 MHz through a 256-bit bus. It also features 1536 SPUs, 96 Texture Address Units, and 32 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7870 XT 6390 points
Radeon HD 7870 6230 points
Difference: 160 (3%)

Ethereum Mining Hash Rate

Radeon HD 7870 16 Mh/s
Radeon HD 7870 XT 15 Mh/s
Difference: 1 (7%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 175 Watts
Radeon HD 7870 XT 185 Watts
Difference: 10 Watts (6%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 XT will be 25% faster than the Radeon HD 7870 overall, because of its higher bandwidth. (explain)

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

Texel Rate

The Radeon HD 7870 XT will be a little bit (about 11%) more effective at anisotropic filtering than the Radeon HD 7870. (explain)

Radeon HD 7870 XT 88800 Mtexels/sec
Radeon HD 7870 80000 Mtexels/sec
Difference: 8800 (11%)

Pixel Rate

The Radeon HD 7870 should be a bit (more or less 8%) more effective at FSAA than the Radeon HD 7870 XT, and capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon HD 7870 XT 29600 Mpixels/sec
Difference: 2400 (8%)

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

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Radeon HD 7870 XT

Amazon.com

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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 HD 7870 XT
Manufacturer AMD AMD
Year March 2012 November 2012
Code Name Pitcairn XT Tahiti LE
Memory 2048 MB 2048 MB
Core Speed 1000 MHz 925 MHz
Memory Speed 4800 MHz 6000 MHz
Power (Max TDP) 175 watts 185 watts
Bandwidth 153600 MB/sec 192000 MB/sec
Texel Rate 80000 Mtexels/sec 88800 Mtexels/sec
Pixel Rate 32000 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 1280 1536
Texture Mapping Units 80 96
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 2800 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. 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 fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 7870

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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