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GeForce GTX 660 Ti vs Radeon HD 6790

Intro

The GeForce GTX 660 Ti makes use of a 28 nm design. nVidia has clocked the core speed at 915 MHz. The GDDR5 memory runs at a frequency of 1500 MHz on this specific model. It features 1344 SPUs as well as 112 Texture Address Units and 24 ROPs.

Compare all of that to the Radeon HD 6790, which uses a 40 nm design. AMD has clocked the core speed at 840 MHz. The GDDR5 memory works at a frequency of 1050 MHz on this specific model. It features 800 SPUs along with 40 TAUs and 16 Rasterization Operator 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 should be much (about 205%) better 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 running with high levels of AA 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

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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 max amount of data (in units of MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high 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 amount of texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few 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.

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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