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Radeon HD 4870 512MB vs Radeon HD 4870 X2

Intro

The Radeon HD 4870 512MB comes with a core clock speed of 750 MHz and a GDDR5 memory speed of 900 MHz. It also makes use of a 256-bit memory bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 4870 X2, which has core 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 Texture Address Units and 16 ROPs.

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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 much better than the Radeon HD 4870 512MB overall. (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 should be quite a bit (approximately 100%) more effective at anisotropic 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 should be quite a bit (about 100%) better at anti-aliasing than the Radeon HD 4870 512MB, and also will be capable of handling higher screen resolutions without losing too much performance. (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: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high 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 of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card 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 ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to 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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