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Radeon HD 4870 2GB vs Radeon HD 4870 X2

Intro

The Radeon HD 4870 2GB features a GPU core clock speed of 750 MHz, and the 2048 MB of GDDR5 memory is set to run at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Compare all that to the Radeon HD 4870 X2, which has clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 2GB 150 Watts
Radeon HD 4870 X2 350 Watts
Difference: 200 Watts (133%)

Memory Bandwidth

The Radeon HD 4870 X2, in theory, should be a lot faster than the Radeon HD 4870 2GB overall. (explain)

Radeon HD 4870 X2 230400 MB/sec
Radeon HD 4870 2GB 115200 MB/sec
Difference: 115200 (100%)

Texel Rate

The Radeon HD 4870 X2 should be a lot (about 100%) more effective at AF than the Radeon HD 4870 2GB. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 30000 (100%)

Pixel Rate

The Radeon HD 4870 X2 will be a lot (approximately 100%) faster with regards to AA than the Radeon HD 4870 2GB, and able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
Radeon HD 4870 2GB 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 2GB

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 2GB Radeon HD 4870 X2
Manufacturer AMD AMD
Year Jun 25, 2008 Aug 12, 2008
Code Name RV770 XT R700
Memory 2048 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: Memory bandwidth is the largest amount of information (in units of MB per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number 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 filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 4870 2GB

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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