GeForce GTX 660 Ti vs Radeon HD 6990

Intro

Compare that to the Radeon HD 6990, which makes use of a 40 nm design. AMD has clocked the core frequency at 830 MHz. The GDDR5 memory is set to run at a frequency of 1250 MHz on this specific model. It features 1536 SPUs as well as 96 TAUs 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

GeForce GTX 660 Ti		6013 points
Radeon HD 6990		5820 points
	Difference: 193 (3%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti		150 Watts
Radeon HD 6990		375 Watts
	Difference: 225 Watts (150%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6990 should be 122% quicker than the GeForce GTX 660 Ti overall, because of its higher data rate. (explain)

Radeon HD 6990		320000 MB/sec
GeForce GTX 660 Ti		144000 MB/sec
	Difference: 176000 (122%)

Texel Rate

The Radeon HD 6990 is a lot (more or less 56%) faster with regards to anisotropic filtering than the GeForce GTX 660 Ti. (explain)

Radeon HD 6990		159360 Mtexels/sec
GeForce GTX 660 Ti		102480 Mtexels/sec
	Difference: 56880 (56%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6990 is superior to the GeForce GTX 660 Ti, and very much so. (explain)

Radeon HD 6990		53120 Mpixels/sec
GeForce GTX 660 Ti		21960 Mpixels/sec
	Difference: 31160 (142%)

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 (measured in megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video 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 amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.