GeForce GTX 1660 Ti vs Radeon HD 7990

Intro

Compare that to the Radeon HD 7990, which uses a 28 nm design. AMD has set the core frequency at 950 MHz. The GDDR5 memory is set to run at a frequency of 1500 MHz on this specific card. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 1660 Ti		120 Watts
Radeon HD 7990		375 Watts
	Difference: 255 Watts (213%)

Memory Bandwidth

The Radeon HD 7990 should in theory perform quite a bit faster than the GeForce GTX 1660 Ti in general. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GTX 1660 Ti		294912 MB/sec
	Difference: 281088 (95%)

Texel Rate

The Radeon HD 7990 should be much (more or less 69%) better at AF than the GeForce GTX 1660 Ti. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GTX 1660 Ti		144000 Mtexels/sec
	Difference: 99200 (69%)

Pixel Rate

The GeForce GTX 1660 Ti should be a small bit (about 18%) more effective at anti-aliasing than the Radeon HD 7990, and also able to handle higher resolutions better. (explain)

GeForce GTX 1660 Ti		72000 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 11200 (18%)

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 information (counted in MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.