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Radeon HD 4870 2GB vs Radeon HD 6790

Intro

The Radeon HD 4870 2GB comes with a GPU core clock speed of 750 MHz, and the 2048 MB of GDDR5 memory is set to run at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

The Radeon HD 6790 should theoretically perform just a bit faster than the Radeon HD 4870 2GB overall. (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 a bit (more or less 12%) better at anisotropic filtering 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 high levels of AA is important to you, then the Radeon HD 6790 is a better choice, but it probably won't make a huge difference. (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: Bandwidth is the maximum amount of data (in units of MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total amount of 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially 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 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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