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Radeon HD 4830 1GB vs Radeon HD 6750

Intro

The Radeon HD 4830 1GB comes with a core clock speed of 575 MHz and a GDDR4 memory speed of 900 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It is comprised of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Compare that to the Radeon HD 6750, which makes use of a 40 nm design. AMD has clocked the core speed at 725 MHz. The GDDR5 memory works at a frequency of 1000 MHz on this model. It features 720 SPUs along with 36 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

The Radeon HD 6750 should in theory perform just a bit faster than the Radeon HD 4830 1GB overall. (explain)

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

Texel Rate

The Radeon HD 6750 is quite a bit (approximately 42%) better at anisotropic filtering than the Radeon HD 4830 1GB. (explain)

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

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6750 is the winner, by far. (explain)

Radeon HD 6750 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

Check prices at:

Radeon HD 6750

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
Manufacturer AMD AMD
Year Oct 21, 2008 January 2011
Code Name RV770 LE Juniper Pro
Memory 1024 MB 512 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 4.0

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be moved past the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once 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 in one second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 4830 1GB

Amazon.com

Check prices at:

Radeon HD 6750

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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