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Radeon HD 5870 vs Radeon R9 280X

Intro

The Radeon HD 5870 features a core clock frequency of 850 MHz and a GDDR5 memory speed of 1200 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It features 1600(320x5) SPUs, 80 TAUs, and 32 Raster Operation Units.

Compare those specifications to the Radeon R9 280X, which uses a 28 nm design. ATi has set the core speed at 850 MHz. The GDDR5 RAM works at a frequency of 1500 MHz on this specific card. It features 2048 SPUs along with 128 TAUs 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, due to its greater 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%) better at anisotropic 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 fill rate, so theoretically they should be equally good at at AA, and be able to handle 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: Bandwidth is the largest amount of information (measured in megabytes per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

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