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Radeon HD 4870 512MB vs Radeon HD 4890 2GB

Intro

The Radeon HD 4870 512MB uses a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 RAM is set to run at a speed of 900 MHz on this particular model. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 4890 2GB, which has a clock frequency of 1000 MHz and a GDDR5 memory frequency of 975 MHz. It also features a 256-bit bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, 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 4890 2GB 190 Watts
Difference: 40 Watts (27%)

Memory Bandwidth

Performance-wise, the Radeon HD 4890 2GB should in theory be just a bit better than the Radeon HD 4870 512MB in general. (explain)

Radeon HD 4890 2GB 124800 MB/sec
Radeon HD 4870 512MB 115200 MB/sec
Difference: 9600 (8%)

Texel Rate

The Radeon HD 4890 2GB will be much (more or less 33%) better at AF than the Radeon HD 4870 512MB. (explain)

Radeon HD 4890 2GB 40000 Mtexels/sec
Radeon HD 4870 512MB 30000 Mtexels/sec
Difference: 10000 (33%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4890 2GB is the winner, by far. (explain)

Radeon HD 4890 2GB 16000 Mpixels/sec
Radeon HD 4870 512MB 12000 Mpixels/sec
Difference: 4000 (33%)

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.

Price Comparison

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Radeon HD 4870 512MB

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 512MB Radeon HD 4890 2GB
Manufacturer AMD AMD
Year Jun 25, 2008 Apr 2, 2009
Code Name RV770 XT RV790 XT
Memory 512 MB 2048 MB
Core Speed 750 MHz 1000 MHz
Memory Speed 3600 MHz 3900 MHz
Power (Max TDP) 150 watts 190 watts
Bandwidth 115200 MB/sec 124800 MB/sec
Texel Rate 30000 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 800(160x5) 800(160x5)
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 55 nm
Transistors 956 million 959 million
Bus PCIe 2.0 x16 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 largest amount of information (measured in MB per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video card will be at handling 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 graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends 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 maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4870 512MB

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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