Radeon HD 5670 vs Radeon HD 7990

Intro

Compare all that to the Radeon HD 7990, which makes use of a 28 nm design. AMD has set the core speed at 950 MHz. The GDDR5 memory runs at a frequency of 1500 MHz on this card. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
Radeon HD 7990		375 Watts
	Difference: 314 Watts (515%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 should be a lot faster than the Radeon HD 5670 overall. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 5670		64000 MB/sec
	Difference: 512000 (800%)

Texel Rate

The Radeon HD 7990 is much (about 1469%) better at texture filtering than the Radeon HD 5670. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 227700 (1469%)

Pixel Rate

The Radeon HD 7990 will be much (more or less 881%) more effective at anti-aliasing than the Radeon HD 5670, and should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 54600 (881%)

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 (measured in megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

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