GeForce GTX 1660 Ti vs Radeon HD 7990

Intro

Compare all that to the Radeon HD 7990, which comes with core clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs as well as 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

Theoretically speaking, the Radeon HD 7990 will be 95% quicker than the GeForce GTX 1660 Ti overall, due to its higher bandwidth. (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%) faster with regards to 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 will be a small bit (more or less 18%) faster with regards to AA than the Radeon HD 7990, and will be able to handle higher screen resolutions more effectively. (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 largest amount of data (counted in MB per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's 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 can be applied in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.