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Radeon HD 4830 1GB vs Radeon HD 6770

Intro

The Radeon HD 4830 1GB has a core clock speed of 575 MHz and a GDDR4 memory frequency of 900 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 6770, which uses a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM runs at a frequency of 1050 MHz on this particular card. It features 800 SPUs as well as 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

In theory, the Radeon HD 6770 should perform a little bit faster than the Radeon HD 4830 1GB overall. (explain)

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

Texel Rate

The Radeon HD 6770 is much (about 96%) better at texture filtering than the Radeon HD 4830 1GB. (explain)

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

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6770 is a better choice, by far. (explain)

Radeon HD 6770 14400 Mpixels/sec
Radeon HD 4830 1GB 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 1GB

Amazon.com

Check prices at:

Radeon HD 6770

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 1GB Radeon HD 6770
Manufacturer AMD AMD
Year Oct 21, 2008 January 2011
Code Name RV770 LE Juniper XT
Memory 1024 MB 512 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 GDDR4 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 max amount of data (counted in megabytes per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is worked out by multiplying the total texture units of the card 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated 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 also depends on lots of other factors, most notably the memory bandwidth of the card - 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 1GB

Amazon.com

Check prices at:

Radeon HD 6770

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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