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Radeon HD 4870 512MB vs Radeon HD 4870 X2

Intro

The Radeon HD 4870 512MB features a core clock frequency of 750 MHz and a GDDR5 memory speed of 900 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 4870 X2, which comes with GPU core speed of 750 MHz, and 1024 MB of GDDR5 RAM set to run at 900 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 512MB 150 Watts
Radeon HD 4870 X2 350 Watts
Difference: 200 Watts (133%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4870 X2 should in theory be a lot superior to the Radeon HD 4870 512MB in general. (explain)

Radeon HD 4870 X2 230400 MB/sec
Radeon HD 4870 512MB 115200 MB/sec
Difference: 115200 (100%)

Texel Rate

The Radeon HD 4870 X2 is much (about 100%) faster with regards to texture filtering than the Radeon HD 4870 512MB. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
Radeon HD 4870 512MB 30000 Mtexels/sec
Difference: 30000 (100%)

Pixel Rate

The Radeon HD 4870 X2 is much (approximately 100%) faster with regards to AA than the Radeon HD 4870 512MB, and also should be able to handle higher resolutions while still performing well. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
Radeon HD 4870 512MB 12000 Mpixels/sec
Difference: 12000 (100%)

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 512MB

Amazon.com

Check prices at:

Radeon HD 4870 X2

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 512MB Radeon HD 4870 X2
Manufacturer AMD AMD
Year Jun 25, 2008 Aug 12, 2008
Code Name RV770 XT R700
Memory 512 MB 1024 MB (x2)
Core Speed 750 MHz 750 MHz (x2)
Memory Speed 3600 MHz 3600 MHz (x2)
Power (Max TDP) 150 watts 350 watts
Bandwidth 115200 MB/sec 230400 MB/sec
Texel Rate 30000 Mtexels/sec 60000 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 800(160x5) 800(160x5) (x2)
Texture Mapping Units 40 40 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit (x2)
Fab Process 55 nm 55 nm
Transistors 956 million 956 million
Bus PCIe 2.0 x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of MB per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units of the card by the core 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 a second.

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

Display Prices

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Radeon HD 4870 512MB

Amazon.com

Check prices at:

Radeon HD 4870 X2

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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