Radeon HD 6770 vs Radeon HD 6990

Intro

Compare all of that to the Radeon HD 6990, which comes with GPU clock speed of 830 MHz, and 2048 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also is comprised of 1536 SPUs, 96 Texture Address Units, and 32 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6990		5820 points
Radeon HD 6770		1520 points
	Difference: 4300 (283%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
Radeon HD 6990		375 Watts
	Difference: 267 Watts (247%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6990 should perform much faster than the Radeon HD 6770 in general. (explain)

Radeon HD 6990		320000 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 252800 (376%)

Texel Rate

The Radeon HD 6990 is quite a bit (approximately 343%) more effective at texture filtering than the Radeon HD 6770. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 123360 (343%)

Pixel Rate

The Radeon HD 6990 will be a lot (about 269%) more effective at FSAA than the Radeon HD 6770, and also should be capable of handling higher resolutions better. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 38720 (269%)

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 max amount of information (counted in MB per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total 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 applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core 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 fill rate is also dependant 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 max fill rate.