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Radeon HD 4890 1GB vs Radeon HD 5850

Intro

The Radeon HD 4890 1GB features a GPU core clock speed of 1000 MHz, and the 1024 MB of GDDR5 RAM runs at 975 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare that to the Radeon HD 5850, which features core speeds of 725 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 1440(288x5) SPUs along with 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

The Radeon HD 5850, in theory, should perform just a bit faster than the Radeon HD 4890 1GB in general. (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 (approximately 31%) better at anisotropic filtering 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

The Radeon HD 5850 should be a lot (more or less 45%) faster with regards to FSAA than the Radeon HD 4890 1GB, and will be capable of handling higher resolutions without losing too much performance. (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

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Radeon HD 5850

Amazon.com

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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 information (counted in MB per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 in one second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the 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 number of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many 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

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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.

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