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Radeon HD 4890 2GB vs Radeon HD 6870

Intro

The Radeon HD 4890 2GB has a GPU core clock speed of 1000 MHz, and the 2048 MB of GDDR5 RAM is set to run at 975 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon HD 6870, which has clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 1120 SPUs along with 56 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6870 151 Watts
Radeon HD 4890 2GB 190 Watts
Difference: 39 Watts (26%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6870 should theoretically be a bit better than the Radeon HD 4890 2GB overall. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 9600 (8%)

Texel Rate

The Radeon HD 6870 will be a lot (approximately 26%) more effective at anisotropic filtering than the Radeon HD 4890 2GB. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 4890 2GB 40000 Mtexels/sec
Difference: 10400 (26%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6870 is superior to the Radeon HD 4890 2GB, by far. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 4890 2GB 16000 Mpixels/sec
Difference: 12800 (80%)

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 4890 2GB

Amazon.com

Check prices at:

Radeon HD 6870

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 4890 2GB Radeon HD 6870
Manufacturer AMD AMD
Year Apr 2, 2009 October 2010
Code Name RV790 XT Barts XT
Memory 2048 MB 1024 MB
Core Speed 1000 MHz 900 MHz
Memory Speed 3900 MHz 4200 MHz
Power (Max TDP) 190 watts 151 watts
Bandwidth 124800 MB/sec 134400 MB/sec
Texel Rate 40000 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 800(160x5) 1120
Texture Mapping Units 40 56
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 959 million 1700 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill 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

Hide Prices

Radeon HD 4890 2GB

Amazon.com

Check prices at:

Radeon HD 6870

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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