Radeon HD 4790 vs Radeon HD 6750

Intro

Compare those specifications to the Radeon HD 6750, which features a clock frequency of 725 MHz and a GDDR5 memory frequency of 1000 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It is made up of 720 SPUs, 36 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4790, in theory, should perform quite a bit faster than the Radeon HD 6750 overall. (explain)

Radeon HD 4790		102400 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 38400 (60%)

Texel Rate

The Radeon HD 6750 should be quite a bit (more or less 36%) faster with regards to anisotropic filtering than the Radeon HD 4790. (explain)

Radeon HD 6750		26100 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 6900 (36%)

Pixel Rate

The Radeon HD 6750 should be much (about 21%) faster with regards to anti-aliasing than the Radeon HD 4790, and also should be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 6750		11600 Mpixels/sec
Radeon HD 4790		9600 Mpixels/sec
	Difference: 2000 (21%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.