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Radeon HD 4870 X2 vs Radeon HD 4890 1GB

Intro

The Radeon HD 4870 X2 makes use of a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 memory works at a frequency of 900 MHz on this particular model. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 4890 1GB, which comes with core speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 1GB 190 Watts
Radeon HD 4870 X2 350 Watts
Difference: 160 Watts (84%)

Memory Bandwidth

In theory, the Radeon HD 4870 X2 should be quite a bit faster than the Radeon HD 4890 1GB overall. (explain)

Radeon HD 4870 X2 230400 MB/sec
Radeon HD 4890 1GB 124800 MB/sec
Difference: 105600 (85%)

Texel Rate

The Radeon HD 4870 X2 should be quite a bit (about 50%) better at texture filtering than the Radeon HD 4890 1GB. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
Radeon HD 4890 1GB 40000 Mtexels/sec
Difference: 20000 (50%)

Pixel Rate

The Radeon HD 4870 X2 will be quite a bit (approximately 50%) more effective at full screen anti-aliasing than the Radeon HD 4890 1GB, and also capable of handling higher screen resolutions better. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
Radeon HD 4890 1GB 16000 Mpixels/sec
Difference: 8000 (50%)

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

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Radeon HD 4890 1GB

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 HD 4890 1GB
Manufacturer AMD AMD
Year Aug 12, 2008 Apr 2, 2009
Code Name R700 RV790 XT
Memory 1024 MB (x2) 1024 MB
Core Speed 750 MHz (x2) 1000 MHz
Memory Speed 3600 MHz (x2) 3900 MHz
Power (Max TDP) 350 watts 190 watts
Bandwidth 230400 MB/sec 124800 MB/sec
Texel Rate 60000 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 24000 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 800(160x5) (x2) 800(160x5)
Texture Mapping Units 40 (x2) 40
Render Output Units 16 (x2) 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 55 nm
Transistors 956 million 959 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe 2.0 x16
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 (in units of megabytes per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 4870 X2

Amazon.com

Check prices at:

Radeon HD 4890 1GB

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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