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Radeon HD 4830 1GB vs Radeon HD 7870

Intro

The Radeon HD 4830 1GB makes use of a 55 nm design. AMD has clocked the core frequency at 575 MHz. The GDDR4 RAM works at a speed of 900 MHz on this particular card. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Compare those specifications to the Radeon HD 7870, which uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 memory works at a speed of 1200 MHz on this particular card. It features 1280 SPUs along with 80 TAUs 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

In theory, the Radeon HD 7870 should be 167% quicker than the Radeon HD 4830 1GB in general, due to its higher data rate. (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 a lot (approximately 335%) better at AF 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

The Radeon HD 7870 should be quite a bit (approximately 248%) more effective at full screen anti-aliasing than the Radeon HD 4830 1GB, and also should be able to handle higher resolutions without slowing down too much. (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 (in units of MB per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 is calculated 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 video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines 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 output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory 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 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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