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Radeon HD 4870 2GB vs Radeon HD 6790

Intro

The Radeon HD 4870 2GB uses a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 RAM runs at a frequency of 900 MHz on this specific model. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 6790, which has clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

The Radeon HD 6790, in theory, should perform just a bit faster than the Radeon HD 4870 2GB in general. (explain)

Radeon HD 6790 134400 MB/sec
Radeon HD 4870 2GB 115200 MB/sec
Difference: 19200 (17%)

Texel Rate

The Radeon HD 6790 will be just a bit (about 12%) faster with regards to AF than the Radeon HD 4870 2GB. (explain)

Radeon HD 6790 33600 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 3600 (12%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 6790 is superior to the Radeon HD 4870 2GB, but only just. (explain)

Radeon HD 6790 13440 Mpixels/sec
Radeon HD 4870 2GB 12000 Mpixels/sec
Difference: 1440 (12%)

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

Check prices at:

Radeon HD 6790

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 4870 2GB Radeon HD 6790
Manufacturer AMD AMD
Year Jun 25, 2008 April 2011
Code Name RV770 XT Barts LE
Memory 2048 MB 1024 MB
Core Speed 750 MHz 840 MHz
Memory Speed 3600 MHz 4200 MHz
Power (Max TDP) 150 watts 150 watts
Bandwidth 115200 MB/sec 134400 MB/sec
Texel Rate 30000 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 800(160x5) 800
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1700 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 per second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - 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 6790

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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