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Radeon HD 7790 vs Radeon HD 7850


Intro

The Radeon HD 7790 comes with a GPU clock speed of 1000 MHz, and the 1024 MB of GDDR5 memory runs at 1500 MHz through a 128-bit bus. It also features 896 Stream Processors, 56 TAUs, and 16 ROPs.

Compare those specifications to the Radeon HD 7850, which features 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 made up of 1024 SPUs, 64 TAUs, and 32 ROPs.

Display Graphs

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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 7790 4330 points
Difference: 870 (20%)

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

Theoretically speaking, the Radeon HD 7850 should be 60% quicker than the Radeon HD 7790 in general, due to its greater 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 just a bit (approximately 2%) better 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 a high resolution is important to you, then the Radeon HD 7850 is superior to the Radeon HD 7790, by far. (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

Radeon HD 7850

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 largest amount of data (in units of megabytes per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once 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, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher 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 amount of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Radeon HD 7790

Radeon HD 7850

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