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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 frequency at 850 MHz. The GDDR5 RAM works at a speed of 1200 MHz on this particular card. It features 1600(320x5) SPUs along with 80 TAUs and 32 ROPs.

Compare that to the Radeon R9 270X, which uses a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM runs at a speed of 1400 MHz on this particular card. It features 1280 SPUs as well as 80 Texture Address Units 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

As far as performance goes, the Radeon R9 270X should in theory be a small bit better than the Radeon HD 5870 overall. (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 (more or less 18%) faster with regards to 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

The Radeon R9 270X will be a small bit (about 18%) more effective at AA than the Radeon HD 5870, and able to handle higher resolutions without slowing down too much. (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: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If it uses 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, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the graphics 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 that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Radeon HD 5870

Radeon R9 270X

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