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Radeon HD 4870 2GB vs Radeon HD 5830

Intro

The Radeon HD 4870 2GB features core clock speeds of 750 MHz on the GPU, and 900 MHz on the 2048 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 5830, which comes with clock speeds of 800 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 1120(224x5) SPUs as well as 56 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 2GB 150 Watts
Radeon HD 5830 175 Watts
Difference: 25 Watts (17%)

Memory Bandwidth

As far as performance goes, the Radeon HD 5830 should in theory be just a bit superior to the Radeon HD 4870 2GB overall. (explain)

Radeon HD 5830 128000 MB/sec
Radeon HD 4870 2GB 115200 MB/sec
Difference: 12800 (11%)

Texel Rate

The Radeon HD 5830 should be quite a bit (more or less 49%) better at AF than the Radeon HD 4870 2GB. (explain)

Radeon HD 5830 44800 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 14800 (49%)

Pixel Rate

The Radeon HD 5830 is a little bit (more or less 7%) faster with regards to AA than the Radeon HD 4870 2GB, and also should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 5830 12800 Mpixels/sec
Radeon HD 4870 2GB 12000 Mpixels/sec
Difference: 800 (7%)

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 4870 2GB

Amazon.com

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Radeon HD 5830

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 4870 2GB Radeon HD 5830
Manufacturer AMD AMD
Year Jun 25, 2008 February 25, 2010
Code Name RV770 XT Cypress LE
Memory 2048 MB 1024 MB
Core Speed 750 MHz 800 MHz
Memory Speed 3600 MHz 4000 MHz
Power (Max TDP) 150 watts 175 watts
Bandwidth 115200 MB/sec 128000 MB/sec
Texel Rate 30000 Mtexels/sec 44800 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 800(160x5) 1120(224x5)
Texture Mapping Units 40 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 2154 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Bandwidth is the max amount of information (counted in megabytes per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once 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 anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 4870 2GB

Amazon.com

Check prices at:

Radeon HD 5830

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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