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Radeon HD 4830 512MB vs Radeon HD 6770 1GB

Intro

The Radeon HD 4830 512MB comes with a core clock speed of 575 MHz and a GDDR3 memory frequency of 900 MHz. It also features a 256-bit bus, and uses a 55 nm design. It is comprised of 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Compare that to the Radeon HD 6770 1GB, which has a clock speed of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 128-bit memory bus, and uses a 40 nm design. It is comprised of 800 SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB 95 Watts
Radeon HD 6770 1GB 108 Watts
Difference: 13 Watts (14%)

Memory Bandwidth

The Radeon HD 6770 1GB should in theory be a little bit faster than the Radeon HD 4830 512MB overall. (explain)

Radeon HD 6770 1GB 67200 MB/sec
Radeon HD 4830 512MB 57600 MB/sec
Difference: 9600 (17%)

Texel Rate

The Radeon HD 6770 1GB will be a lot (about 96%) better at AF than the Radeon HD 4830 512MB. (explain)

Radeon HD 6770 1GB 36000 Mtexels/sec
Radeon HD 4830 512MB 18400 Mtexels/sec
Difference: 17600 (96%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6770 1GB is superior to the Radeon HD 4830 512MB, by a large margin. (explain)

Radeon HD 6770 1GB 14400 Mpixels/sec
Radeon HD 4830 512MB 9200 Mpixels/sec
Difference: 5200 (57%)

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

Check prices at:

Radeon HD 6770 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 4830 512MB Radeon HD 6770 1GB
Manufacturer AMD AMD
Year Oct 21, 2008 January 2011
Code Name RV770 LE Juniper XT
Memory 512 MB 1024 MB
Core Speed 575 MHz 900 MHz
Memory Speed 1800 MHz 4200 MHz
Power (Max TDP) 95 watts 108 watts
Bandwidth 57600 MB/sec 67200 MB/sec
Texel Rate 18400 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 9200 Mpixels/sec 14400 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 128-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1040 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of data (counted in MB per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video 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 amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 4830 512MB

Amazon.com

Check prices at:

Radeon HD 6770 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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