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Radeon HD 4830 1GB vs Radeon HD 7870

Intro

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

Compare those specifications to the Radeon HD 7870, which features a clock speed of 1000 MHz and a GDDR5 memory frequency of 1200 MHz. It also features a 256-bit bus, and uses a 28 nm design. It is made up of 1280 SPUs, 80 Texture Address Units, and 32 ROPs.

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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

Theoretically speaking, the Radeon HD 7870 will be 167% quicker than the Radeon HD 4830 1GB overall, due to its higher bandwidth. (explain)

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

Texel Rate

The Radeon HD 7870 will be a lot (more or less 335%) faster with regards to texture 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 a high resolution is important to you, then the Radeon HD 7870 is the winner, by far. (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 largest amount of data (in units of megabytes per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum 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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