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Radeon HD 5870 vs Radeon HD 6790

Intro

The Radeon HD 5870 features a core clock frequency of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is comprised of 1600(320x5) SPUs, 80 TAUs, and 32 ROPs.

Compare those specifications to the Radeon HD 6790, which comes with core speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790 150 Watts
Radeon HD 5870 188 Watts
Difference: 38 Watts (25%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5870 should perform a little bit faster than the Radeon HD 6790 in general. (explain)

Radeon HD 5870 153600 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 19200 (14%)

Texel Rate

The Radeon HD 5870 will be much (more or less 102%) more effective at anisotropic filtering than the Radeon HD 6790. (explain)

Radeon HD 5870 68000 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 34400 (102%)

Pixel Rate

The Radeon HD 5870 will be quite a bit (approximately 102%) faster with regards to full screen anti-aliasing than the Radeon HD 6790, and also able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 5870 27200 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 13760 (102%)

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 5870

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 5870 Radeon HD 6790
Manufacturer AMD AMD
Year September 23, 2009 April 2011
Code Name Cypress XT Barts LE
Memory 1024 MB 1024 MB
Core Speed 850 MHz 840 MHz
Memory Speed 4800 MHz 4200 MHz
Power (Max TDP) 188 watts 150 watts
Bandwidth 153600 MB/sec 134400 MB/sec
Texel Rate 68000 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 1600(320x5) 800
Texture Mapping Units 80 40
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 2154 million 1700 million
Bus PCIe 2.1 x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 processed in one second. This figure is worked out by multiplying the total texture units 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 processed per second.

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

Display Prices

Hide Prices

Radeon HD 5870

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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