Radeon HD 5750 512MB vs Radeon HD 7990

Intro

Compare that to the Radeon HD 7990, which features a clock speed of 950 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 384-bit memory bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 512MB		86 Watts
Radeon HD 7990		375 Watts
	Difference: 289 Watts (336%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 should be quite a bit faster than the Radeon HD 5750 512MB in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 5750 512MB		73600 MB/sec
	Difference: 502400 (683%)

Texel Rate

The Radeon HD 7990 will be a lot (more or less 865%) better at anisotropic filtering than the Radeon HD 5750 512MB. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 5750 512MB		25200 Mtexels/sec
	Difference: 218000 (865%)

Pixel Rate

The Radeon HD 7990 is a lot (about 443%) better at anti-aliasing than the Radeon HD 5750 512MB, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 5750 512MB		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: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total number 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 could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.