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Radeon HD 4730 vs Radeon HD 6770 1GB

Intro

The Radeon HD 4730 has clock speeds of 700 MHz on the GPU, and 900 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs as well as 32 Texture Address Units and 8 Rasterization Operator Units.

Compare that to the Radeon HD 6770 1GB, which makes use of a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM is set to run at a frequency of 1050 MHz on this model. It features 800 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB 108 Watts
Radeon HD 4730 140 Watts
Difference: 32 Watts (30%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 1GB is 17% faster than the Radeon HD 4730 in general, due to its greater bandwidth. (explain)

Radeon HD 6770 1GB 67200 MB/sec
Radeon HD 4730 57600 MB/sec
Difference: 9600 (17%)

Texel Rate

The Radeon HD 6770 1GB will be quite a bit (approximately 61%) faster with regards to anisotropic filtering than the Radeon HD 4730. (explain)

Radeon HD 6770 1GB 36000 Mtexels/sec
Radeon HD 4730 22400 Mtexels/sec
Difference: 13600 (61%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6770 1GB is a better choice, by a large margin. (explain)

Radeon HD 6770 1GB 14400 Mpixels/sec
Radeon HD 4730 5600 Mpixels/sec
Difference: 8800 (157%)

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 4730

Amazon.com

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Radeon HD 6770 1GB

Amazon.com

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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 4730 Radeon HD 6770 1GB
Manufacturer AMD AMD
Year Jun 8, 2009 January 2011
Code Name RV770/CE Juniper XT
Memory 512 MB 1024 MB
Core Speed 700 MHz 900 MHz
Memory Speed 3600 MHz 4200 MHz
Power (Max TDP) 140 watts 108 watts
Bandwidth 57600 MB/sec 67200 MB/sec
Texel Rate 22400 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 5600 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 640(128x5) 800
Texture Mapping Units 32 40
Render Output Units 8 16
Bus Type GDDR5 GDDR5
Bus Width 128-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: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video 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 the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 4730

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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