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Radeon HD 4790 vs Radeon HD 5850

Intro

The Radeon HD 4790 uses a 55 nm design. AMD has set the core speed at 600 MHz. The GDDR5 memory runs at a speed of 800 MHz on this specific model. It features 640(128x5) SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 5850, which has GPU core speed of 725 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 256-bit bus. It also is made up of 1440(288x5) Stream Processors, 72 TAUs, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 5850 should be a lot faster than the Radeon HD 4790 overall. (explain)

Radeon HD 5850 128000 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 25600 (25%)

Texel Rate

The Radeon HD 5850 is much (more or less 172%) faster with regards to texture filtering than the Radeon HD 4790. (explain)

Radeon HD 5850 52200 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 33000 (172%)

Pixel Rate

The Radeon HD 5850 should be a lot (approximately 142%) more effective at FSAA than the Radeon HD 4790, and capable of handling higher resolutions while still performing well. (explain)

Radeon HD 5850 23200 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 13600 (142%)

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 4790

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 4790 Radeon HD 5850
Manufacturer AMD AMD
Year 2009 September 30, 2009
Code Name RV790 Cypress PRO
Memory 512 MB 1024 MB
Core Speed 600 MHz 725 MHz
Memory Speed 3200 MHz 4000 MHz
Power (Max TDP) (Unknown) watts 151 watts
Bandwidth 102400 MB/sec 128000 MB/sec
Texel Rate 19200 Mtexels/sec 52200 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 23200 Mpixels/sec
Unified Shaders 640(128x5) 1440(288x5)
Texture Mapping Units 32 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 (in units of MB per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock 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 processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 4790

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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