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Radeon HD 4870 X2 vs Radeon R9 280

Intro

The Radeon HD 4870 X2 comes with a GPU clock speed of 750 MHz, and the 1024 MB of GDDR5 memory is set to run at 900 MHz through a 256-bit bus. It also features 800(160x5) Stream Processors, 40 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon R9 280, which comes with a clock speed of 933 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 384-bit bus, and makes use of a 28 nm design. It is made up of 1792 SPUs, 112 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 280 250 Watts
Radeon HD 4870 X2 350 Watts
Difference: 100 Watts (40%)

Memory Bandwidth

As far as performance goes, the Radeon R9 280 should theoretically be just a bit superior to the Radeon HD 4870 X2 in general. (explain)

Radeon R9 280 240000 MB/sec
Radeon HD 4870 X2 230400 MB/sec
Difference: 9600 (4%)

Texel Rate

The Radeon R9 280 should be much (more or less 74%) more effective at AF than the Radeon HD 4870 X2. (explain)

Radeon R9 280 104496 Mtexels/sec
Radeon HD 4870 X2 60000 Mtexels/sec
Difference: 44496 (74%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 280 is the winner, by a large margin. (explain)

Radeon R9 280 29856 Mpixels/sec
Radeon HD 4870 X2 24000 Mpixels/sec
Difference: 5856 (24%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 4870 X2

Amazon.com

Check prices at:

Radeon R9 280

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 4870 X2 Radeon R9 280
Manufacturer AMD AMD
Year Aug 12, 2008 March 2014
Code Name R700 Tahiti Pro
Memory 1024 MB (x2) 3072 MB
Core Speed 750 MHz (x2) 933 MHz
Memory Speed 3600 MHz (x2) 5000 MHz
Power (Max TDP) 350 watts 250 watts
Bandwidth 230400 MB/sec 240000 MB/sec
Texel Rate 60000 Mtexels/sec 104496 Mtexels/sec
Pixel Rate 24000 Mpixels/sec 29856 Mpixels/sec
Unified Shaders 800(160x5) (x2) 1792
Texture Mapping Units 40 (x2) 112
Render Output Units 16 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 384-bit
Fab Process 55 nm 28 nm
Transistors 956 million 4313 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.2
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4870 X2

Amazon.com

Check prices at:

Radeon R9 280

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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