Radeon HD 5750 1GB vs Radeon HD 7990

Intro

Compare those specs to the Radeon HD 7990, which comes with a core clock frequency of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 384-bit bus, and uses a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 1GB		86 Watts
Radeon HD 7990		375 Watts
	Difference: 289 Watts (336%)

Memory Bandwidth

The Radeon HD 7990, in theory, should be much faster than the Radeon HD 5750 1GB in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 5750 1GB		73600 MB/sec
	Difference: 502400 (683%)

Texel Rate

The Radeon HD 7990 is much (approximately 865%) faster with regards to texture filtering than the Radeon HD 5750 1GB. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 5750 1GB		25200 Mtexels/sec
	Difference: 218000 (865%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7990 is the winner, and very much so. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 5750 1GB		11200 Mpixels/sec
	Difference: 49600 (443%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (counted in megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can 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 Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.