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Radeon HD 4830 512MB vs Radeon HD 6870

Intro

The Radeon HD 4830 512MB features a GPU core speed of 575 MHz, and the 512 MB of GDDR3 RAM runs at 900 MHz through a 256-bit bus. It also is comprised of 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 6870, which makes use of a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM runs at a speed of 1050 MHz on this card. It features 1120 SPUs along with 56 TAUs and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB 95 Watts
Radeon HD 6870 151 Watts
Difference: 56 Watts (59%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6870 should in theory be quite a bit better than the Radeon HD 4830 512MB overall. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 4830 512MB 57600 MB/sec
Difference: 76800 (133%)

Texel Rate

The Radeon HD 6870 will be quite a bit (approximately 174%) better at AF than the Radeon HD 4830 512MB. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 4830 512MB 18400 Mtexels/sec
Difference: 32000 (174%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6870 is superior to the Radeon HD 4830 512MB, and very much so. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 4830 512MB 9200 Mpixels/sec
Difference: 19600 (213%)

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 512MB

Amazon.com

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Radeon HD 6870

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 4830 512MB Radeon HD 6870
Manufacturer AMD AMD
Year Oct 21, 2008 October 2010
Code Name RV770 LE Barts XT
Memory 512 MB 1024 MB
Core Speed 575 MHz 900 MHz
Memory Speed 1800 MHz 4200 MHz
Power (Max TDP) 95 watts 151 watts
Bandwidth 57600 MB/sec 134400 MB/sec
Texel Rate 18400 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 9200 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 640(128x5) 1120
Texture Mapping Units 32 56
Render Output Units 16 32
Bus Type GDDR3 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1700 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 maximum amount of information (in units of MB per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 amount of texture map elements (texels) that are applied in one second. This number 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 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 most pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 4830 512MB

Amazon.com

Check prices at:

Radeon HD 6870

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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