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Radeon HD 7870 vs Radeon HD 7870 XT

Intro

The Radeon HD 7870 comes with a core clock frequency of 1000 MHz and a GDDR5 memory frequency of 1200 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 1280 SPUs, 80 Texture Address Units, and 32 ROPs.

Compare all that to the Radeon HD 7870 XT, which uses a 28 nm design. AMD has clocked the core frequency at 925 MHz. The GDDR5 memory is set to run at a speed of 1500 MHz on this card. It features 1536 SPUs along with 96 Texture Address Units and 32 Rasterization Operator Units.

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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

In theory, the Radeon HD 7870 XT will be 25% quicker than the Radeon HD 7870 overall, because of its greater 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 should be a bit (approximately 11%) faster with regards to texture 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 is a bit (approximately 8%) more effective at FSAA than the Radeon HD 7870 XT, and should be capable of handling higher screen resolutions better. (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

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 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: Bandwidth is the largest amount of data (in units of MB per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability 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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