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Radeon HD 7790 vs Radeon HD 7850

Intro

The Radeon HD 7790 has a GPU core clock speed of 1000 MHz, and the 1024 MB of GDDR5 RAM runs at 1500 MHz through a 128-bit bus. It also features 896 SPUs, 56 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 7850, which makes use of a 28 nm design. AMD has clocked the core speed at 860 MHz. The GDDR5 memory runs at a frequency of 1200 MHz on this particular card. It features 1024 SPUs along with 64 Texture Address Units and 32 Rasterization Operator Units.

(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 should perform quite a bit faster than the Radeon HD 7790 in general. (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 small bit (about 2%) better at AF than the Radeon HD 7850. (explain)

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

Pixel Rate

The Radeon HD 7850 will be much (approximately 72%) faster with regards to FSAA than the Radeon HD 7790, and also will be capable of handling higher screen resolutions while still performing well. (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 information (measured in megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the graphics 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 maximum number of pixels that the graphics chip can possibly record 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 the core 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 rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

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