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Radeon HD 4870 1GB vs Radeon HD 4890 2GB

Intro

The Radeon HD 4870 1GB uses a 55 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 RAM works at a frequency of 900 MHz on this card. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 4890 2GB, which uses a 55 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory works at a speed of 975 MHz on this specific 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 4870 1GB 150 Watts
Radeon HD 4890 2GB 190 Watts
Difference: 40 Watts (27%)

Memory Bandwidth

In theory, the Radeon HD 4890 2GB should be a bit faster than the Radeon HD 4870 1GB in general. (explain)

Radeon HD 4890 2GB 124800 MB/sec
Radeon HD 4870 1GB 115200 MB/sec
Difference: 9600 (8%)

Texel Rate

The Radeon HD 4890 2GB is a lot (approximately 33%) more effective at AF than the Radeon HD 4870 1GB. (explain)

Radeon HD 4890 2GB 40000 Mtexels/sec
Radeon HD 4870 1GB 30000 Mtexels/sec
Difference: 10000 (33%)

Pixel Rate

The Radeon HD 4890 2GB will be a lot (approximately 33%) better at AA than the Radeon HD 4870 1GB, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 4890 2GB 16000 Mpixels/sec
Radeon HD 4870 1GB 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 1GB

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 1GB Radeon HD 4890 2GB
Manufacturer AMD AMD
Year Jun 25, 2008 Apr 2, 2009
Code Name RV770 XT RV790 XT
Memory 1024 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: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of 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 most pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4870 1GB

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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