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Radeon HD 4890 1GB vs Radeon HD 5850

Intro

The Radeon HD 4890 1GB uses a 55 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM works at a frequency of 975 MHz on this specific model. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 5850, which uses a 40 nm design. AMD has clocked the core frequency at 725 MHz. The GDDR5 memory works at a frequency of 1000 MHz on this specific model. It features 1440(288x5) SPUs as well as 72 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5850 151 Watts
Radeon HD 4890 1GB 190 Watts
Difference: 39 Watts (26%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5850 should be just a bit faster than the Radeon HD 4890 1GB overall. (explain)

Radeon HD 5850 128000 MB/sec
Radeon HD 4890 1GB 124800 MB/sec
Difference: 3200 (3%)

Texel Rate

The Radeon HD 5850 will be a lot (more or less 31%) better at AF than the Radeon HD 4890 1GB. (explain)

Radeon HD 5850 52200 Mtexels/sec
Radeon HD 4890 1GB 40000 Mtexels/sec
Difference: 12200 (31%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 5850 is the winner, by a large margin. (explain)

Radeon HD 5850 23200 Mpixels/sec
Radeon HD 4890 1GB 16000 Mpixels/sec
Difference: 7200 (45%)

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 1GB

Amazon.com

Check prices at:

Radeon HD 5850

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 1GB Radeon HD 5850
Manufacturer AMD AMD
Year Apr 2, 2009 September 30, 2009
Code Name RV790 XT Cypress PRO
Memory 1024 MB 1024 MB
Core Speed 1000 MHz 725 MHz
Memory Speed 3900 MHz 4000 MHz
Power (Max TDP) 190 watts 151 watts
Bandwidth 124800 MB/sec 128000 MB/sec
Texel Rate 40000 Mtexels/sec 52200 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 23200 Mpixels/sec
Unified Shaders 800(160x5) 1440(288x5)
Texture Mapping Units 40 72
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 959 million 2154 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4890 1GB

Amazon.com

Check prices at:

Radeon HD 5850

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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