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Radeon HD 4870 X2 vs Radeon R9 270X

Intro

The Radeon HD 4870 X2 uses a 55 nm design. AMD has set the core speed at 750 MHz. The GDDR5 memory is set to run at a speed of 900 MHz on this specific model. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Compare those specifications to the Radeon R9 270X, which comes with clock speeds of 1000 MHz on the GPU, and 1400 MHz on the 2048 MB of GDDR5 memory. It features 1280 SPUs as well as 80 TAUs and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270X 180 Watts
Radeon HD 4870 X2 350 Watts
Difference: 170 Watts (94%)

Memory Bandwidth

The Radeon HD 4870 X2, in theory, should be much faster than the Radeon R9 270X in general. (explain)

Radeon HD 4870 X2 230400 MB/sec
Radeon R9 270X 179200 MB/sec
Difference: 51200 (29%)

Texel Rate

The Radeon R9 270X will be a lot (approximately 33%) faster with regards to AF than the Radeon HD 4870 X2. (explain)

Radeon R9 270X 80000 Mtexels/sec
Radeon HD 4870 X2 60000 Mtexels/sec
Difference: 20000 (33%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 270X is superior to the Radeon HD 4870 X2, and very much so. (explain)

Radeon R9 270X 32000 Mpixels/sec
Radeon HD 4870 X2 24000 Mpixels/sec
Difference: 8000 (33%)

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 270X

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 270X
Manufacturer AMD AMD
Year Aug 12, 2008 October 2013
Code Name R700 Curacao XT
Memory 1024 MB (x2) 2048 MB
Core Speed 750 MHz (x2) 1000 MHz
Memory Speed 3600 MHz (x2) 5600 MHz
Power (Max TDP) 350 watts 180 watts
Bandwidth 230400 MB/sec 179200 MB/sec
Texel Rate 60000 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 24000 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 800(160x5) (x2) 1280
Texture Mapping Units 40 (x2) 80
Render Output Units 16 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 28 nm
Transistors 956 million 2800 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 transported over the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is calculated by multiplying the total amount of texture units by the core clock 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 4870 X2

Amazon.com

Check prices at:

Radeon R9 270X

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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