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Radeon HD 5870 vs Radeon R9 280X

Intro

The Radeon HD 5870 comes with 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 TAUs and 32 Rasterization Operator Units.

Compare those specs to the Radeon R9 280X, which has core speeds of 850 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5870 188 Watts
Radeon R9 280X 250 Watts
Difference: 62 Watts (33%)

Memory Bandwidth

In theory, the Radeon R9 280X is 88% quicker than the Radeon HD 5870 in general, because of its higher data rate. (explain)

Radeon R9 280X 288000 MB/sec
Radeon HD 5870 153600 MB/sec
Difference: 134400 (88%)

Texel Rate

The Radeon R9 280X will be quite a bit (more or less 60%) faster with regards to texture filtering than the Radeon HD 5870. (explain)

Radeon R9 280X 108800 Mtexels/sec
Radeon HD 5870 68000 Mtexels/sec
Difference: 40800 (60%)

Pixel Rate

Both cards have the exact same pixel rate, so theoretically they should perform equally good at at anti-aliasing, and be capable of handling the same screen resolutions. (explain)

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 280X

Amazon.com

Other US-based stores

Specifications

Model Radeon HD 5870 Radeon R9 280X
Manufacturer ATi ATi
Year September 23, 2009 October 2013
Code Name Cypress XT Tahiti XTL
Fab Process 40 nm 28 nm
Bus PCIe 2.1 x16 PCIe 3.0 x16
Memory 1024 MB 3072 MB
Core Speed 850 MHz 850 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1200 MHz (4800 MHz effective) 1500 MHz (6000 MHz effective)
Unified Shaders 1600(320x5) 2048
Texture Mapping Units 80 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
DirectX Version DirectX 11 DirectX 11.2
OpenGL Version OpenGL 3.2 OpenGL 4.3
Power (Max TDP) 188 watts 250 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 288000 MB/sec
Texel Rate 68000 Mtexels/sec 108800 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 27200 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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