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Radeon HD 7870 vs Radeon R9 270

Intro

The Radeon HD 7870 makes use of a 28 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 memory runs at a frequency of 1200 MHz on this model. It features 1280 SPUs along with 80 TAUs and 32 ROPs.

Compare all that to the Radeon R9 270, which has clock speeds of 900 MHz on the GPU, and 1400 MHz on the 2048 MB of GDDR5 memory. It features 1280 SPUs along with 80 TAUs and 32 Rasterization Operator Units.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270 150 Watts
Radeon HD 7870 175 Watts
Difference: 25 Watts (17%)

Memory Bandwidth

Theoretically, the Radeon R9 270 should perform a small bit faster than the Radeon HD 7870 overall. (explain)

Radeon R9 270 179200 MB/sec
Radeon HD 7870 153600 MB/sec
Difference: 25600 (17%)

Texel Rate

The Radeon HD 7870 is a small bit (more or less 11%) better at texture filtering than the Radeon R9 270. (explain)

Radeon HD 7870 80000 Mtexels/sec
Radeon R9 270 72000 Mtexels/sec
Difference: 8000 (11%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7870 is superior to the Radeon R9 270, though only just barely. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon R9 270 28800 Mpixels/sec
Difference: 3200 (11%)

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

Radeon R9 270

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

Display Specifications

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Model Radeon HD 7870 Radeon R9 270
Manufacturer AMD AMD
Year March 2012 November 2013
Code Name Pitcairn XT Curacao Pro
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 2048 MB
Core Speed 1000 MHz 900 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 4800 MHz 5600 MHz
Unified Shaders 1280 1280
Texture Mapping Units 80 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.2 OpenGL 4.3
Power (Max TDP) 175 watts 150 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 179200 MB/sec
Texel Rate 80000 Mtexels/sec 72000 Mtexels/sec
Pixel Rate 32000 Mpixels/sec 28800 Mpixels/sec

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

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total amount of texture units of the card 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 applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

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