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Radeon HD 7790 vs Radeon HD 7850

Intro

The Radeon HD 7790 uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 memory is set to run at a frequency of 1500 MHz on this specific card. It features 896 SPUs as well as 56 Texture Address Units and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 7850, which features a core clock frequency of 860 MHz and a GDDR5 memory frequency of 1200 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It is comprised of 1024 SPUs, 64 Texture Address Units, and 32 ROPs.

(No game benchmarks for this combination yet.)

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 will be 60% faster than the Radeon HD 7790 in general, because of its greater data rate. (explain)

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

Texel Rate

The Radeon HD 7790 is a small bit (more or less 2%) more effective at anisotropic filtering than the Radeon HD 7850. (explain)

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

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 7850 is the winner, and very much so. (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

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

Model Radeon HD 7790 Radeon HD 7850
Manufacturer AMD AMD
Year March 2013 March 2012
Code Name Bonaire XT Pitcairn Pro
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 1024 MB 2048 MB
Core Speed 1000 MHz 860 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1500 MHz (6000 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 896 1024
Texture Mapping Units 56 64
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2
Power (Max TDP) 85 watts 130 watts
Shader Model 5.0 5.0
Bandwidth 96000 MB/sec 153600 MB/sec
Texel Rate 56000 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 27520 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (counted in megabytes per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

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