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GeForce GTX 1080 vs Radeon HD 7870 XT

Intro

The GeForce GTX 1080 makes use of a 16 nm design. nVidia has clocked the core speed at 1607 MHz. The GDDR5X memory is set to run at a speed of 1251 MHz on this model. It features 2560 SPUs along with 160 Texture Address Units and 64 ROPs.

Compare those specs to the Radeon HD 7870 XT, which uses a 28 nm design. AMD has clocked the core frequency at 925 MHz. The GDDR5 RAM runs at a frequency of 1500 MHz on this particular model. It features 1536 SPUs as well as 96 TAUs 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

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

In theory, the GeForce GTX 1080 should be 71% quicker than the Radeon HD 7870 XT overall, due to its higher data rate. (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%) faster with regards to texture 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 a better choice, by far. (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: Bandwidth is the maximum amount of data (measured in MB per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs 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 fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum 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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