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Radeon HD 4830 512MB vs Radeon HD 6790

Intro

The Radeon HD 4830 512MB makes use of a 55 nm design. AMD has clocked the core frequency at 575 MHz. The GDDR3 memory is set to run at a speed of 900 MHz on this card. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

Compare all that to the Radeon HD 6790, which features GPU clock speed of 840 MHz, and 1024 MB of GDDR5 memory running at 1050 MHz through a 256-bit bus. It also features 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB 95 Watts
Radeon HD 6790 150 Watts
Difference: 55 Watts (58%)

Memory Bandwidth

Theoretically, the Radeon HD 6790 should perform much faster than the Radeon HD 4830 512MB in general. (explain)

Radeon HD 6790 134400 MB/sec
Radeon HD 4830 512MB 57600 MB/sec
Difference: 76800 (133%)

Texel Rate

The Radeon HD 6790 will be quite a bit (more or less 83%) faster with regards to anisotropic filtering than the Radeon HD 4830 512MB. (explain)

Radeon HD 6790 33600 Mtexels/sec
Radeon HD 4830 512MB 18400 Mtexels/sec
Difference: 15200 (83%)

Pixel Rate

The Radeon HD 6790 is a lot (about 46%) more effective at FSAA than the Radeon HD 4830 512MB, and also capable of handling higher screen resolutions better. (explain)

Radeon HD 6790 13440 Mpixels/sec
Radeon HD 4830 512MB 9200 Mpixels/sec
Difference: 4240 (46%)

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 4830 512MB

Amazon.com

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Radeon HD 6790

Amazon.com

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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 4830 512MB Radeon HD 6790
Manufacturer AMD AMD
Year Oct 21, 2008 April 2011
Code Name RV770 LE Barts LE
Memory 512 MB 1024 MB
Core Speed 575 MHz 840 MHz
Memory Speed 1800 MHz 4200 MHz
Power (Max TDP) 95 watts 150 watts
Bandwidth 57600 MB/sec 134400 MB/sec
Texel Rate 18400 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 9200 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 640(128x5) 800
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR3 GDDR5
Bus Width 256-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: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 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 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably 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 4830 512MB

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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