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GeForce GTX 660 vs Radeon HD 6790

Intro

The GeForce GTX 660 comes with core clock speeds of 980 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 RAM. It features 960 SPUs along with 80 TAUs and 24 Rasterization Operator Units.

Compare those specs to the Radeon HD 6790, which comes with clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs along with 40 Texture Address Units 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 6790		2150 points
	Difference: 2913 (135%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660		140 Watts
Radeon HD 6790		150 Watts
	Difference: 10 Watts (7%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 should theoretically be a little bit superior to the Radeon HD 6790 in general. (explain)

GeForce GTX 660		144192 MB/sec
Radeon HD 6790		134400 MB/sec
	Difference: 9792 (7%)

Texel Rate

The GeForce GTX 660 should be quite a bit (about 133%) faster with regards to texture filtering than the Radeon HD 6790. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 44800 (133%)

Pixel Rate

The GeForce GTX 660 is a lot (more or less 75%) better at FSAA than the Radeon HD 6790, and also should be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 10080 (75%)

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

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Radeon HD 6790

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Specifications

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Model	GeForce GTX 660	Radeon HD 6790
Manufacturer	nVidia	AMD
Year	September 2012	April 2011
Code Name	GK106	Barts LE
Memory	2048 MB	1024 MB
Core Speed	980 MHz	840 MHz
Memory Speed	6008 MHz	4200 MHz
Power (Max TDP)	140 watts	150 watts
Bandwidth	144192 MB/sec	134400 MB/sec
Texel Rate	78400 Mtexels/sec	33600 Mtexels/sec
Pixel Rate	23520 Mpixels/sec	13440 Mpixels/sec
Unified Shaders	960	800
Texture Mapping Units	80	40
Render Output Units	24	16
Bus Type	GDDR5	GDDR5
Bus Width	192-bit	256-bit
Fab Process	28 nm	40 nm
Transistors	2540 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 largest amount of data (counted in megabytes per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen 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 better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines 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 quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

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