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Radeon HD 4790 vs Radeon HD 4890 1GB

Intro

The Radeon HD 4790 comes with a core clock speed of 600 MHz and a GDDR5 memory frequency of 800 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 4890 1GB, which comes with a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 975 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4890 1GB should be 22% quicker than the Radeon HD 4790 in general, because of its greater data rate. (explain)

Radeon HD 4890 1GB 124800 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 22400 (22%)

Texel Rate

The Radeon HD 4890 1GB is quite a bit (about 108%) more effective at texture filtering than the Radeon HD 4790. (explain)

Radeon HD 4890 1GB 40000 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 20800 (108%)

Pixel Rate

The Radeon HD 4890 1GB is a lot (approximately 67%) better at anti-aliasing than the Radeon HD 4790, and also will be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 4890 1GB 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

Check prices at:

Radeon HD 4890 1GB

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 1GB
Manufacturer AMD AMD
Year 2009 Apr 2, 2009
Code Name RV790 RV790 XT
Memory 512 MB 1024 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 maximum amount of information (counted in MB per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the video 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 amount of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units 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 fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 4790

Amazon.com

Check prices at:

Radeon HD 4890 1GB

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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