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Radeon HD 5870 vs Radeon R9 270X

Intro

The Radeon HD 5870 comes with a GPU core clock speed of 850 MHz, and the 1024 MB of GDDR5 RAM is set to run at 1200 MHz through a 256-bit bus. It also features 1600(320x5) SPUs, 80 Texture Address Units, and 32 ROPs.

Compare all that to the Radeon R9 270X, which features clock speeds of 1000 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.

(No game benchmarks for this combination yet.)

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

In theory, the Radeon R9 270X will be 17% faster than the Radeon HD 5870 overall, due to its greater data rate. (explain)

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

Texel Rate

The Radeon R9 270X should be just a bit (approximately 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 should be a bit (about 18%) faster with regards to anti-aliasing than the Radeon HD 5870, and should be capable of handling higher screen resolutions without losing too much performance. (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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

Radeon HD 5870

Amazon.com

Other US-based stores

Radeon R9 270X

Amazon.com

Other US-based stores

Specifications

Model Radeon HD 5870 Radeon R9 270X
Manufacturer ATi ATi
Year September 23, 2009 October 2013
Code Name Cypress XT Curacao XT
Fab Process 40 nm 28 nm
Bus PCIe 2.1 x16 PCIe 3.0 x16
Memory 1024 MB 2048 MB
Core Speed 850 MHz 1000 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1200 MHz (4800 MHz effective) 1400 MHz (5600 MHz effective)
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
DirectX Version DirectX 11 DirectX 11.2
OpenGL Version OpenGL 3.2 OpenGL 4.3
Power (Max TDP) 188 watts 180 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 179200 MB/sec
Texel Rate 68000 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 32000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. 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 number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics 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 that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

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