GeForce GTX 1660 Ti vs Radeon HD 7990

Intro

Compare all that to the Radeon HD 7990, which makes use of a 28 nm design. AMD has set the core speed at 950 MHz. The GDDR5 memory is set to run at a speed of 1500 MHz on this particular model. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

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

As far as performance goes, the Radeon HD 7990 should theoretically be much superior to 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 will be a lot (more or less 69%) more effective at texture filtering 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 bit (about 18%) better at AA than the Radeon HD 7990, and also should be able to handle higher screen resolutions without slowing down too much. (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 max amount of information (counted in megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, the result 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video 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 the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.