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Radeon HD 4770 vs Radeon HD 4830 1GB

Intro

The Radeon HD 4770 comes with a GPU core speed of 750 MHz, and the 512 MB of GDDR5 memory is set to run at 800 MHz through a 128-bit bus. It also features 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 4830 1GB, which comes with GPU clock speed of 575 MHz, and 1024 MB of GDDR4 RAM running at 900 MHz through a 256-bit bus. It also features 640(128x5) Stream Processors, 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 1GB 95 Watts
Difference: 15 Watts (19%)

Memory Bandwidth

Performance-wise, the Radeon HD 4830 1GB should in theory be a bit superior to the Radeon HD 4770 overall. (explain)

Radeon HD 4830 1GB 57600 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 6400 (13%)

Texel Rate

The Radeon HD 4770 is much (about 30%) faster with regards to texture filtering than the Radeon HD 4830 1GB. (explain)

Radeon HD 4770 24000 Mtexels/sec
Radeon HD 4830 1GB 18400 Mtexels/sec
Difference: 5600 (30%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4770 is superior to the Radeon HD 4830 1GB, and very much so. (explain)

Radeon HD 4770 12000 Mpixels/sec
Radeon HD 4830 1GB 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 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 4770 Radeon HD 4830 1GB
Manufacturer AMD AMD
Year Apr 28, 2009 Oct 21, 2008
Code Name RV740 RV770 LE
Memory 512 MB 1024 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 GDDR4
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 largest amount of data (measured in megabytes per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4770

Amazon.com

Check prices at:

Radeon HD 4830 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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