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Radeon HD 4770 vs Radeon HD 4830 512MB

Intro

The Radeon HD 4770 comes with core speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs as well as 32 TAUs and 16 ROPs.

Compare all that to the Radeon HD 4830 512MB, which uses a 55 nm design. AMD has set the core frequency at 575 MHz. The GDDR3 memory is set to run at a frequency of 900 MHz on this particular card. It features 640(128x5) SPUs as well as 32 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770 80 Watts
Radeon HD 4830 512MB 95 Watts
Difference: 15 Watts (19%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4830 512MB will be 13% faster than the Radeon HD 4770 overall, due to its greater bandwidth. (explain)

Radeon HD 4830 512MB 57600 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 6400 (13%)

Texel Rate

The Radeon HD 4770 is quite a bit (about 30%) better at anisotropic filtering than the Radeon HD 4830 512MB. (explain)

Radeon HD 4770 24000 Mtexels/sec
Radeon HD 4830 512MB 18400 Mtexels/sec
Difference: 5600 (30%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4770 is the winner, and very much so. (explain)

Radeon HD 4770 12000 Mpixels/sec
Radeon HD 4830 512MB 9200 Mpixels/sec
Difference: 2800 (30%)

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 4770

Amazon.com

Check prices at:

Radeon HD 4830 512MB

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 4770 Radeon HD 4830 512MB
Manufacturer AMD AMD
Year Apr 28, 2009 Oct 21, 2008
Code Name RV740 RV770 LE
Memory 512 MB 512 MB
Core Speed 750 MHz 575 MHz
Memory Speed 3200 MHz 1800 MHz
Power (Max TDP) 80 watts 95 watts
Bandwidth 51200 MB/sec 57600 MB/sec
Texel Rate 24000 Mtexels/sec 18400 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 9200 Mpixels/sec
Unified Shaders 640(128x5) 640(128x5)
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type GDDR5 GDDR3
Bus Width 128-bit 256-bit
Fab Process 40 nm 55 nm
Transistors 826 million 956 million
Bus PCIe 2.0 x16 PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 can be processed per second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4770

Amazon.com

Check prices at:

Radeon HD 4830 512MB

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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