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Radeon HD 4870 X2 vs Radeon HD 4890 2GB

Intro

The Radeon HD 4870 X2 features a GPU core clock speed of 750 MHz, and the 1024 MB of GDDR5 RAM runs 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.

Compare those specifications to the Radeon HD 4890 2GB, which makes use of a 55 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 RAM works at a speed of 975 MHz on this particular card. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 2GB 190 Watts
Radeon HD 4870 X2 350 Watts
Difference: 160 Watts (84%)

Memory Bandwidth

Performance-wise, the Radeon HD 4870 X2 should in theory be a lot superior to the Radeon HD 4890 2GB in general. (explain)

Radeon HD 4870 X2 230400 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 105600 (85%)

Texel Rate

The Radeon HD 4870 X2 will be quite a bit (more or less 50%) better at texture filtering than the Radeon HD 4890 2GB. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
Radeon HD 4890 2GB 40000 Mtexels/sec
Difference: 20000 (50%)

Pixel Rate

The Radeon HD 4870 X2 is a lot (about 50%) more effective at full screen anti-aliasing than the Radeon HD 4890 2GB, and capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
Radeon HD 4890 2GB 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

Check prices at:

Radeon HD 4890 2GB

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 2GB
Manufacturer AMD AMD
Year Aug 12, 2008 Apr 2, 2009
Code Name R700 RV790 XT
Memory 1024 MB (x2) 2048 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: Bandwidth is the max amount of data (measured in MB per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant 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 maximum fill rate.

Display Prices

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Radeon HD 4870 X2

Amazon.com

Check prices at:

Radeon HD 4890 2GB

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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