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Radeon HD 4830 512MB vs Radeon HD 6770 1GB

Intro

The Radeon HD 4830 512MB comes with a clock speed of 575 MHz and a GDDR3 memory speed of 900 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It features 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Compare that to the Radeon HD 6770 1GB, which comes with core speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs along with 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

Theoretically speaking, the Radeon HD 6770 1GB will be 17% quicker than the Radeon HD 4830 512MB overall, because of its higher data rate. (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 should be much (approximately 96%) better at texture filtering 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

The Radeon HD 6770 1GB should be a lot (more or less 57%) more effective at AA than the Radeon HD 4830 512MB, and also should be capable of handling higher resolutions without slowing down too much. (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 maximum amount of data (in units of megabytes per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 processed per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the clock 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 rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max 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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