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Radeon HD 4830 1GB vs Radeon HD 6750 1GB

Intro

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

Compare that to the Radeon HD 6750 1GB, which comes with a core clock speed of 725 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It is made up of 720 SPUs, 36 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB 86 Watts
Radeon HD 4830 1GB 95 Watts
Difference: 9 Watts (10%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6750 1GB should theoretically be a little bit better than the Radeon HD 4830 1GB in general. (explain)

Radeon HD 6750 1GB 64000 MB/sec
Radeon HD 4830 1GB 57600 MB/sec
Difference: 6400 (11%)

Texel Rate

The Radeon HD 6750 1GB will be quite a bit (about 42%) more effective at AF than the Radeon HD 4830 1GB. (explain)

Radeon HD 6750 1GB 26100 Mtexels/sec
Radeon HD 4830 1GB 18400 Mtexels/sec
Difference: 7700 (42%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 6750 1GB is a better choice, by far. (explain)

Radeon HD 6750 1GB 11600 Mpixels/sec
Radeon HD 4830 1GB 9200 Mpixels/sec
Difference: 2400 (26%)

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

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Radeon HD 6750 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 1GB Radeon HD 6750 1GB
Manufacturer AMD AMD
Year Oct 21, 2008 January 2011
Code Name RV770 LE Juniper Pro
Memory 1024 MB 1024 MB
Core Speed 575 MHz 725 MHz
Memory Speed 1800 MHz 4000 MHz
Power (Max TDP) 95 watts 86 watts
Bandwidth 57600 MB/sec 64000 MB/sec
Texel Rate 18400 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 9200 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 640(128x5) 720
Texture Mapping Units 32 36
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 largest amount of information (counted in megabytes per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR 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 number of texture units by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs 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 fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4830 1GB

Amazon.com

Check prices at:

Radeon HD 6750 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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