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Radeon HD 6750 1GB vs Radeon HD 7790

Intro

The Radeon HD 6750 1GB comes with a GPU clock speed of 725 MHz, and the 1024 MB of GDDR5 memory runs at 1000 MHz through a 128-bit bus. It also is comprised of 720 SPUs, 36 Texture Address Units, and 16 ROPs.

Compare all that to the Radeon HD 7790, which uses a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM is set to run at a frequency of 1500 MHz on this particular model. It features 896 SPUs along with 56 Texture Address Units and 16 ROPs.

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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, the Radeon HD 7790 should be quite a bit faster than the Radeon HD 6750 1GB overall. (explain)

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

Texel Rate

The Radeon HD 7790 will be quite a bit (about 115%) faster with regards to texture 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 running with lots of anti-aliasing is important to you, then the Radeon HD 7790 is superior to the Radeon HD 6750 1GB, 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

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Radeon HD 6750 1GB

Amazon.com

Radeon HD 7790

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 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 max amount of information (counted in megabytes per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. 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 also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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