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Radeon HD 6790 vs Radeon HD 7850

Intro

The Radeon HD 6790 makes use of a 40 nm design. AMD has set the core frequency at 840 MHz. The GDDR5 memory runs at a frequency of 1050 MHz on this specific card. It features 800 SPUs along with 40 TAUs and 16 ROPs.

Compare those specifications to the Radeon HD 7850, which has core clock speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1024 SPUs along with 64 Texture Address Units and 32 Rasterization Operator Units.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7850 5200 points
Radeon HD 6790 2150 points
Difference: 3050 (142%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
Radeon HD 6790 150 Watts
Difference: 20 Watts (15%)

Memory Bandwidth

In theory, the Radeon HD 7850 should be 14% quicker than the Radeon HD 6790 in general, because of its greater data rate. (explain)

Radeon HD 7850 153600 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 19200 (14%)

Texel Rate

The Radeon HD 7850 is much (more or less 64%) better at anisotropic filtering than the Radeon HD 6790. (explain)

Radeon HD 7850 55040 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 21440 (64%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7850 is the winner, by far. (explain)

Radeon HD 7850 27520 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 14080 (105%)

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 6790

Amazon.com

Check prices at:

Radeon HD 7850

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 6790 Radeon HD 7850
Manufacturer AMD AMD
Year April 2011 March 2012
Code Name Barts LE Pitcairn Pro
Memory 1024 MB 2048 MB
Core Speed 840 MHz 860 MHz
Memory Speed 4200 MHz 4800 MHz
Power (Max TDP) 150 watts 130 watts
Bandwidth 134400 MB/sec 153600 MB/sec
Texel Rate 33600 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 13440 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 800 1024
Texture Mapping Units 40 64
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 1700 million 2800 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Bandwidth is the max amount of information (in units of megabytes per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the video 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 could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 6790

Amazon.com

Check prices at:

Radeon HD 7850

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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