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Radeon HD 4830 1GB vs Radeon HD 7870

Intro

The Radeon HD 4830 1GB features clock speeds of 575 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR4 memory. It features 640(128x5) SPUs along with 32 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 7870, which comes with a core clock speed of 1000 MHz and a GDDR5 memory speed of 1200 MHz. It also makes use of a 256-bit memory bus, and uses a 28 nm design. It features 1280 SPUs, 80 TAUs, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 1GB 95 Watts
Radeon HD 7870 175 Watts
Difference: 80 Watts (84%)

Memory Bandwidth

The Radeon HD 7870 should theoretically perform quite a bit faster than the Radeon HD 4830 1GB overall. (explain)

Radeon HD 7870 153600 MB/sec
Radeon HD 4830 1GB 57600 MB/sec
Difference: 96000 (167%)

Texel Rate

The Radeon HD 7870 should be much (more or less 335%) more effective at anisotropic filtering than the Radeon HD 4830 1GB. (explain)

Radeon HD 7870 80000 Mtexels/sec
Radeon HD 4830 1GB 18400 Mtexels/sec
Difference: 61600 (335%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7870 is a better choice, by a large margin. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon HD 4830 1GB 9200 Mpixels/sec
Difference: 22800 (248%)

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 7870

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 7870
Manufacturer AMD AMD
Year Oct 21, 2008 March 2012
Code Name RV770 LE Pitcairn XT
Memory 1024 MB 2048 MB
Core Speed 575 MHz 1000 MHz
Memory Speed 1800 MHz 4800 MHz
Power (Max TDP) 95 watts 175 watts
Bandwidth 57600 MB/sec 153600 MB/sec
Texel Rate 18400 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 9200 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 640(128x5) 1280
Texture Mapping Units 32 80
Render Output Units 16 32
Bus Type GDDR4 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 28 nm
Transistors 956 million 2800 million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's 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 texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour 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 quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4830 1GB

Amazon.com

Check prices at:

Radeon HD 7870

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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