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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 frequency at 1607 MHz. The GDDR5X RAM works at a frequency of 1251 MHz on this card. It features 2560 SPUs along with 160 TAUs and 64 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7870 XT, which makes use of a 28 nm design. AMD has clocked the core frequency at 925 MHz. The GDDR5 RAM is set to run at a speed of 1500 MHz on this particular model. It features 1536 SPUs as well as 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

GeForce GTX 1080 22050 points
Radeon HD 7870 XT 6390 points
Difference: 15660 (245%)

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

The GeForce GTX 1080 should in theory be a lot faster than the Radeon HD 7870 XT overall. (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 quite a bit (approximately 190%) more effective at 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

The GeForce GTX 1080 is much (approximately 247%) more effective at anti-aliasing than the Radeon HD 7870 XT, and will be able to handle higher resolutions without losing too much performance. (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 max amount of data (counted in MB per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better 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 record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential 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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