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Radeon HD 5870 vs Radeon R9 270X


Intro

The Radeon HD 5870 uses a 40 nm design. AMD has clocked the core speed at 850 MHz. The GDDR5 RAM is set to run at a frequency of 1200 MHz on this model. It features 1600(320x5) SPUs as well as 80 Texture Address Units and 32 Rasterization Operator Units.

Compare all of that to the Radeon R9 270X, which has GPU 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 SPUs, 80 TAUs, and 32 ROPs.

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

Theoretically, the Radeon R9 270X should 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 will be just a bit (approximately 18%) better at texture filtering than the Radeon HD 5870. (explain)

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

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 270X is superior to the Radeon HD 5870, but only just. (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

Radeon HD 5870

Radeon R9 270X

Specifications

Display 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: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 processed in one second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Radeon HD 5870

Radeon R9 270X

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