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Radeon HD 7870 XT vs Radeon R9 270X


Intro

The Radeon HD 7870 XT comes with clock speeds of 925 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs as well as 96 TAUs and 32 ROPs.

Compare those specs to the Radeon R9 270X, which comes with a core clock frequency of 1000 MHz and a GDDR5 memory speed of 1400 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It features 1280 SPUs, 80 Texture Address Units, and 32 ROPs.

Display Graphs

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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 R9 270X 6560 points
Radeon HD 7870 XT 6390 points
Difference: 170 (3%)

Ethereum Mining Hash Rate

Radeon R9 270X 18 Mh/s
Radeon HD 7870 XT 15 Mh/s
Difference: 3 (20%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270X 180 Watts
Radeon HD 7870 XT 185 Watts
Difference: 5 Watts (3%)

Memory Bandwidth

In theory, the Radeon HD 7870 XT should perform just a bit faster than the Radeon R9 270X overall. (explain)

Radeon HD 7870 XT 192000 MB/sec
Radeon R9 270X 179200 MB/sec
Difference: 12800 (7%)

Texel Rate

The Radeon HD 7870 XT should be a small bit (about 11%) better at anisotropic filtering than the Radeon R9 270X. (explain)

Radeon HD 7870 XT 88800 Mtexels/sec
Radeon R9 270X 80000 Mtexels/sec
Difference: 8800 (11%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 270X is the winner, though not by far. (explain)

Radeon R9 270X 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

Radeon HD 7870 XT

Radeon R9 270X

Specifications

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Model Radeon HD 7870 XT Radeon R9 270X
Manufacturer AMD AMD
Year November 2012 October 2013
Code Name Tahiti LE Curacao XT
Memory 2048 MB 2048 MB
Core Speed 925 MHz 1000 MHz
Memory Speed 6000 MHz 5600 MHz
Power (Max TDP) 185 watts 180 watts
Bandwidth 192000 MB/sec 179200 MB/sec
Texel Rate 88800 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 1536 1280
Texture Mapping Units 96 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 4313 million 2800 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.3 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video 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 the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. 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 is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Radeon HD 7870 XT

Radeon R9 270X

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