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Radeon HD 7790 vs Radeon HD 7850

Intro

The Radeon HD 7790 comes with a clock speed of 1000 MHz and a GDDR5 memory frequency of 1500 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 896 SPUs, 56 TAUs, and 16 Raster Operation Units.

Compare that to the Radeon HD 7850, which comes with a GPU core clock speed of 860 MHz, and 2048 MB of GDDR5 RAM set to run at 1200 MHz through a 256-bit bus. It also is comprised of 1024 SPUs, 64 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
Radeon HD 7850 130 Watts
Difference: 45 Watts (53%)

Memory Bandwidth

In theory, the Radeon HD 7850 should be 60% faster than the Radeon HD 7790 overall, due to its higher bandwidth. (explain)

Radeon HD 7850 153600 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 57600 (60%)

Texel Rate

The Radeon HD 7790 should be a little bit (approximately 2%) faster with regards to AF than the Radeon HD 7850. (explain)

Radeon HD 7790 56000 Mtexels/sec
Radeon HD 7850 55040 Mtexels/sec
Difference: 960 (2%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7850 is superior to the Radeon HD 7790, by a large margin. (explain)

Radeon HD 7850 27520 Mpixels/sec
Radeon HD 7790 16000 Mpixels/sec
Difference: 11520 (72%)

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 7790

Amazon.com

Radeon HD 7850

Amazon.com

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 7790 Radeon HD 7850
Manufacturer AMD AMD
Year March 2013 March 2012
Code Name Bonaire XT Pitcairn Pro
Memory 1024 MB 2048 MB
Core Speed 1000 MHz 860 MHz
Memory Speed 6000 MHz 4800 MHz
Power (Max TDP) 85 watts 130 watts
Bandwidth 96000 MB/sec 153600 MB/sec
Texel Rate 56000 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 896 1024
Texture Mapping Units 56 64
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 2080 million 2800 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the clock 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 rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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