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GeForce GTX 660 Ti vs Radeon HD 6790

Intro

The GeForce GTX 660 Ti features a GPU core clock speed of 915 MHz, and the 2048 MB of GDDR5 RAM runs at 1500 MHz through a 192-bit bus. It also is comprised of 1344 SPUs, 112 TAUs, and 24 ROPs.

Compare those specs to the Radeon HD 6790, which has a GPU core clock speed of 840 MHz, and 1024 MB of GDDR5 RAM running at 1050 MHz through a 256-bit bus. It also is comprised of 800 Stream Processors, 40 TAUs, and 16 Raster Operation Units.

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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 6790 2150 points
Difference: 3863 (180%)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically, the GeForce GTX 660 Ti should be a small bit faster than the Radeon HD 6790 overall. (explain)

GeForce GTX 660 Ti 144000 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 9600 (7%)

Texel Rate

The GeForce GTX 660 Ti will be a lot (about 205%) more effective at texture filtering than the Radeon HD 6790. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 68880 (205%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 660 Ti is superior to the Radeon HD 6790, by far. (explain)

GeForce GTX 660 Ti 21960 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 8520 (63%)

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.

Price Comparison

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GeForce GTX 660 Ti

Amazon.com

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Radeon HD 6790

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 660 Ti Radeon HD 6790
Manufacturer nVidia AMD
Year August 2012 April 2011
Code Name GK104 Barts LE
Memory 2048 MB 1024 MB
Core Speed 915 MHz 840 MHz
Memory Speed 6000 MHz 4200 MHz
Power (Max TDP) 150 watts 150 watts
Bandwidth 144000 MB/sec 134400 MB/sec
Texel Rate 102480 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 1344 800
Texture Mapping Units 112 40
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 3540 million 1700 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, 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 AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce GTX 660 Ti

Amazon.com

Check prices at:

Radeon HD 6790

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.

Comments

One Response to “GeForce GTX 660 Ti vs Radeon HD 6790”
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