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GeForce GTX 1660 Ti vs Radeon HD 7990

Intro

The GeForce GTX 1660 Ti features a clock speed of 1500 MHz and a GDDR6 memory frequency of 12000 MHz. It also features a 192-bit bus, and uses a 12 nm design. It is comprised of 1536 SPUs, 96 TAUs, and 48 Raster Operation Units.

Compare those specifications to the Radeon HD 7990, which features a clock speed of 950 MHz and a GDDR5 memory frequency of 1500 MHz. It also uses a 384-bit bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation 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

In theory, the Radeon HD 7990 should perform much faster than the GeForce GTX 1660 Ti overall. (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 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

If using a high resolution is important to you, then the GeForce GTX 1660 Ti is a better choice, though only just barely. (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

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GeForce GTX 1660 Ti

Amazon.com

Check prices at:

Radeon HD 7990

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce GTX 1660 Ti Radeon HD 7990
Manufacturer nVidia AMD
Year February 2019 April 2013
Code Name TU116-400-A1 Malta
Memory 6144 MB 3072 MB (x2)
Core Speed 1500 MHz 950 MHz (x2)
Memory Speed 12000 GB/s 6000 MHz (x2)
Power (Max TDP) 120 watts 375 watts
Bandwidth 294912 MB/sec 576000 MB/sec
Texel Rate 144000 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 72000 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 1536 2048 (x2)
Texture Mapping Units 96 128 (x2)
Render Output Units 48 32 (x2)
Bus Type GDDR6 GDDR5
Bus Width 192-bit 384-bit (x2)
Fab Process 12 nm 28 nm
Transistors 6600 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12.0 DirectX 11.1
OpenGL Version OpenGL 4.6 OpenGL 4.3

Memory Bandwidth: Bandwidth is the largest amount of data (in units of MB per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, 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 the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 1660 Ti

Amazon.com

Check prices at:

Radeon HD 7990

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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