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GeForce GTX 660 vs Radeon HD 7790

Intro

The GeForce GTX 660 comes with a clock speed of 980 MHz and a GDDR5 memory speed of 1502 MHz. It also features a 192-bit memory bus, and uses a 28 nm design. It is made up of 960 SPUs, 80 TAUs, and 24 Raster Operation Units.

Compare those specs to the Radeon HD 7790, which comes with clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 memory. It features 896 SPUs as well as 56 TAUs and 16 ROPs.

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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 5063 points
Radeon HD 7790 4330 points
Difference: 733 (17%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
GeForce GTX 660 140 Watts
Difference: 55 Watts (65%)

Memory Bandwidth

In theory, the GeForce GTX 660 should perform much faster than the Radeon HD 7790 in general. (explain)

GeForce GTX 660 144192 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 48192 (50%)

Texel Rate

The GeForce GTX 660 should be much (about 40%) more effective at anisotropic filtering than the Radeon HD 7790. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 7790 56000 Mtexels/sec
Difference: 22400 (40%)

Pixel Rate

The GeForce GTX 660 is quite a bit (approximately 47%) better at AA than the Radeon HD 7790, and will be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 660 23520 Mpixels/sec
Radeon HD 7790 16000 Mpixels/sec
Difference: 7520 (47%)

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

Amazon.com

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Radeon HD 7790

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 Radeon HD 7790
Manufacturer nVidia AMD
Year September 2012 March 2013
Code Name GK106 Bonaire XT
Memory 2048 MB 1024 MB
Core Speed 980 MHz 1000 MHz
Memory Speed 6008 MHz 6000 MHz
Power (Max TDP) 140 watts 85 watts
Bandwidth 144192 MB/sec 96000 MB/sec
Texel Rate 78400 Mtexels/sec 56000 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 960 896
Texture Mapping Units 80 56
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 128-bit
Fab Process 28 nm 28 nm
Transistors 2540 million 2080 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 are applied per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce GTX 660

Amazon.com

Check prices at:

Radeon HD 7790

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 vs Radeon HD 7790”
Thiago Theodorio says:

Hello, Good morning.
I just want to communicate that this site do not have the Chip GeForce GTX 560 SE. Can you tell me why?
Thanks and regards,
Thiago Theodorio

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