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Radeon HD 5870 vs Radeon R9 270X

Intro

The Radeon HD 5870 has core speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 RAM. It features 1600(320x5) SPUs as well as 80 Texture Address Units and 32 ROPs.

Compare all that to the Radeon R9 270X, which comes with a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 RAM running at 1400 MHz through a 256-bit bus. It also is made up of 1280 Stream Processors, 80 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270X 180 Watts
Radeon HD 5870 188 Watts
Difference: 8 Watts (4%)

Memory Bandwidth

The Radeon R9 270X should in theory perform just a bit faster than the Radeon HD 5870 in general. (explain)

Radeon R9 270X 179200 MB/sec
Radeon HD 5870 153600 MB/sec
Difference: 25600 (17%)

Texel Rate

The Radeon R9 270X is a small bit (about 18%) faster with regards to anisotropic filtering than the Radeon HD 5870. (explain)

Radeon R9 270X 80000 Mtexels/sec
Radeon HD 5870 68000 Mtexels/sec
Difference: 12000 (18%)

Pixel Rate

The Radeon R9 270X is a small bit (about 18%) more effective at FSAA than the Radeon HD 5870, and able to handle higher resolutions while still performing well. (explain)

Radeon R9 270X 32000 Mpixels/sec
Radeon HD 5870 27200 Mpixels/sec
Difference: 4800 (18%)

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 5870

Amazon.com

Radeon R9 270X

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 Radeon HD 5870 Radeon R9 270X
Manufacturer AMD AMD
Year September 23, 2009 October 2013
Code Name Cypress XT Curacao XT
Memory 1024 MB 2048 MB
Core Speed 850 MHz 1000 MHz
Memory Speed 4800 MHz 5600 MHz
Power (Max TDP) 188 watts 180 watts
Bandwidth 153600 MB/sec 179200 MB/sec
Texel Rate 68000 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 1600(320x5) 1280
Texture Mapping Units 80 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 2154 million 2800 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.2
OpenGL Version OpenGL 3.2 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. 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 texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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