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Radeon HD 6750 1GB vs Radeon HD 7790

Intro

The Radeon HD 6750 1GB features core speeds of 725 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 720 SPUs along with 36 Texture Address Units and 16 Rasterization Operator Units.

Compare that to the Radeon HD 7790, which features clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 memory. It features 896 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
Radeon HD 6750 1GB 86 Watts
Difference: 1 Watts (1%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7790 is 50% quicker than the Radeon HD 6750 1GB overall, because of its greater bandwidth. (explain)

Radeon HD 7790 96000 MB/sec
Radeon HD 6750 1GB 64000 MB/sec
Difference: 32000 (50%)

Texel Rate

The Radeon HD 7790 is a lot (about 115%) faster with regards to anisotropic filtering than the Radeon HD 6750 1GB. (explain)

Radeon HD 7790 56000 Mtexels/sec
Radeon HD 6750 1GB 26100 Mtexels/sec
Difference: 29900 (115%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7790 is the winner, and very much so. (explain)

Radeon HD 7790 16000 Mpixels/sec
Radeon HD 6750 1GB 11600 Mpixels/sec
Difference: 4400 (38%)

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 6750 1GB

Radeon HD 7790

Specifications

Display Specifications

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Model Radeon HD 6750 1GB Radeon HD 7790
Manufacturer AMD AMD
Year January 2011 March 2013
Code Name Juniper Pro Bonaire XT
Memory 1024 MB 1024 MB
Core Speed 725 MHz 1000 MHz
Memory Speed 4000 MHz 6000 MHz
Power (Max TDP) 86 watts 85 watts
Bandwidth 64000 MB/sec 96000 MB/sec
Texel Rate 26100 Mtexels/sec 56000 Mtexels/sec
Pixel Rate 11600 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 720 896
Texture Mapping Units 36 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 1040 million 2080 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Radeon HD 6750 1GB

Radeon HD 7790

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