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Radeon HD 4730 vs Radeon HD 6790

Intro

The Radeon HD 4730 features clock speeds of 700 MHz on the GPU, and 900 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs as well as 32 TAUs and 8 Rasterization Operator Units.

Compare that to the Radeon HD 6790, which comes with a clock speed of 840 MHz and a GDDR5 memory frequency of 1050 MHz. It also features a 256-bit bus, and uses a 40 nm design. It is made up of 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4730 140 Watts
Radeon HD 6790 150 Watts
Difference: 10 Watts (7%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6790 should perform a lot faster than the Radeon HD 4730 in general. (explain)

Radeon HD 6790 134400 MB/sec
Radeon HD 4730 57600 MB/sec
Difference: 76800 (133%)

Texel Rate

The Radeon HD 6790 is quite a bit (about 50%) better at texture filtering than the Radeon HD 4730. (explain)

Radeon HD 6790 33600 Mtexels/sec
Radeon HD 4730 22400 Mtexels/sec
Difference: 11200 (50%)

Pixel Rate

The Radeon HD 6790 will be much (about 140%) more effective at AA than the Radeon HD 4730, and capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 6790 13440 Mpixels/sec
Radeon HD 4730 5600 Mpixels/sec
Difference: 7840 (140%)

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 4730

Amazon.com

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Radeon HD 6790

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 4730 Radeon HD 6790
Manufacturer AMD AMD
Year Jun 8, 2009 April 2011
Code Name RV770/CE Barts LE
Memory 512 MB 1024 MB
Core Speed 700 MHz 840 MHz
Memory Speed 3600 MHz 4200 MHz
Power (Max TDP) 140 watts 150 watts
Bandwidth 57600 MB/sec 134400 MB/sec
Texel Rate 22400 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 5600 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 640(128x5) 800
Texture Mapping Units 32 40
Render Output Units 8 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1700 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's 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 number of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 4730

Amazon.com

Check prices at:

Radeon HD 6790

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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