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GeForce GTX 1080 vs Radeon HD 7870 XT

Intro

The GeForce GTX 1080 comes with a GPU clock speed of 1607 MHz, and the 8192 MB of GDDR5X RAM is set to run at 1251 MHz through a 256-bit bus. It also features 2560 Stream Processors, 160 TAUs, and 64 ROPs.

Compare those specs to the Radeon HD 7870 XT, which features GPU clock speed of 925 MHz, and 2048 MB of GDDR5 RAM set to run 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

GeForce GTX 1080 21919 points
Radeon HD 7870 XT 6390 points
Difference: 15529 (243%)

Ethereum Mining Hash Rate

GeForce GTX 1080 20 Mh/s
Radeon HD 7870 XT 15 Mh/s
Difference: 5 (33%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 1080 180 Watts
Radeon HD 7870 XT 185 Watts
Difference: 5 Watts (3%)

Memory Bandwidth

Performance-wise, the GeForce GTX 1080 should theoretically be a lot better than the Radeon HD 7870 XT in general. (explain)

GeForce GTX 1080 327680 MB/sec
Radeon HD 7870 XT 192000 MB/sec
Difference: 135680 (71%)

Texel Rate

The GeForce GTX 1080 will be a lot (about 190%) better at anisotropic filtering than the Radeon HD 7870 XT. (explain)

GeForce GTX 1080 257120 Mtexels/sec
Radeon HD 7870 XT 88800 Mtexels/sec
Difference: 168320 (190%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 1080 is the winner, and very much so. (explain)

GeForce GTX 1080 102848 Mpixels/sec
Radeon HD 7870 XT 29600 Mpixels/sec
Difference: 73248 (247%)

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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GeForce GTX 1080

Amazon.com

Radeon HD 7870 XT

Amazon.com

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 GeForce GTX 1080 Radeon HD 7870 XT
Manufacturer nVidia AMD
Year May 2016 November 2012
Code Name GP104-400 Tahiti LE
Memory 8192 MB 2048 MB
Core Speed 1607 MHz 925 MHz
Memory Speed 10008 MHz 6000 MHz
Power (Max TDP) 180 watts 185 watts
Bandwidth 327680 MB/sec 192000 MB/sec
Texel Rate 257120 Mtexels/sec 88800 Mtexels/sec
Pixel Rate 102848 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 2560 1536
Texture Mapping Units 160 96
Render Output Units 64 32
Bus Type GDDR5X GDDR5
Bus Width 256-bit 256-bit
Fab Process 16 nm 28 nm
Transistors 7200 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12.0 DirectX 11.1
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high 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 number of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce GTX 1080

Amazon.com

Radeon HD 7870 XT

Amazon.com

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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