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Radeon HD 4790 vs Radeon HD 4890 2GB

Intro

The Radeon HD 4790 makes use of a 55 nm design. AMD has set the core frequency at 600 MHz. The GDDR5 memory works at a speed of 800 MHz on this particular card. It features 640(128x5) SPUs as well as 32 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 4890 2GB, which has a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 memory running at 975 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4890 2GB, in theory, should perform a lot faster than the Radeon HD 4790 in general. (explain)

Radeon HD 4890 2GB 124800 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 22400 (22%)

Texel Rate

The Radeon HD 4890 2GB will be much (about 108%) more effective at anisotropic filtering than the Radeon HD 4790. (explain)

Radeon HD 4890 2GB 40000 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 20800 (108%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4890 2GB is superior to the Radeon HD 4790, by a large margin. (explain)

Radeon HD 4890 2GB 16000 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 6400 (67%)

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

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Radeon HD 4890 2GB

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 4890 2GB
Manufacturer AMD AMD
Year 2009 Apr 2, 2009
Code Name RV790 RV790 XT
Memory 512 MB 2048 MB
Core Speed 600 MHz 1000 MHz
Memory Speed 3200 MHz 3900 MHz
Power (Max TDP) (Unknown) watts 190 watts
Bandwidth 102400 MB/sec 124800 MB/sec
Texel Rate 19200 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 640(128x5) 800(160x5)
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 55 nm
Transistors 959 million 959 million
Bus PCIe 2.0 x16 PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core 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 is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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Radeon HD 4790

Amazon.com

Check prices at:

Radeon HD 4890 2GB

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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