Radeon HD 5750 512MB vs Radeon HD 6990

Intro

Compare that to the Radeon HD 6990, which features GPU clock speed of 830 MHz, and 2048 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also is comprised of 1536 Stream Processors, 96 Texture Address Units, 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 6990		375 Watts
	Difference: 289 Watts (336%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6990 should be 335% faster than the Radeon HD 5750 512MB in general, due to its greater data rate. (explain)

Radeon HD 6990		320000 MB/sec
Radeon HD 5750 512MB		73600 MB/sec
	Difference: 246400 (335%)

Texel Rate

The Radeon HD 6990 will be quite a bit (approximately 532%) more effective at anisotropic filtering than the Radeon HD 5750 512MB. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon HD 5750 512MB		25200 Mtexels/sec
	Difference: 134160 (532%)

Pixel Rate

The Radeon HD 6990 should be much (more or less 374%) faster with regards to AA than the Radeon HD 5750 512MB, and also capable of handling higher resolutions more effectively. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon HD 5750 512MB		11200 Mpixels/sec
	Difference: 41920 (374%)

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 maximum amount of information (counted in megabytes per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 can be applied in one second. This number is calculated by multiplying the total texture units of the card by the core 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 maximum number of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of 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 output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.