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Radeon HD 4890 2GB vs Radeon HD 5850

Intro

The Radeon HD 4890 2GB comes with a clock frequency of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also uses a 256-bit memory bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 5850, which comes with a core clock speed of 725 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 256-bit memory bus, and uses a 40 nm design. It is comprised of 1440(288x5) SPUs, 72 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5850 151 Watts
Radeon HD 4890 2GB 190 Watts
Difference: 39 Watts (26%)

Memory Bandwidth

Performance-wise, the Radeon HD 5850 should theoretically be a small bit superior to the Radeon HD 4890 2GB overall. (explain)

Radeon HD 5850 128000 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 3200 (3%)

Texel Rate

The Radeon HD 5850 will be quite a bit (more or less 31%) more effective at anisotropic filtering than the Radeon HD 4890 2GB. (explain)

Radeon HD 5850 52200 Mtexels/sec
Radeon HD 4890 2GB 40000 Mtexels/sec
Difference: 12200 (31%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 5850 is superior to the Radeon HD 4890 2GB, by a large margin. (explain)

Radeon HD 5850 23200 Mpixels/sec
Radeon HD 4890 2GB 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 2GB

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 2GB Radeon HD 5850
Manufacturer AMD AMD
Year Apr 2, 2009 September 30, 2009
Code Name RV790 XT Cypress PRO
Memory 2048 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: Bandwidth is the maximum amount of information (measured in MB per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. 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 applied in one second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the graphics 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 card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs 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 rate also depends on lots of 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 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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