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GeForce GTX 660 Ti vs Radeon HD 6850

Intro

The GeForce GTX 660 Ti comes with a clock frequency of 915 MHz and a GDDR5 memory frequency of 1500 MHz. It also uses a 192-bit bus, and makes use of a 28 nm design. It is comprised of 1344 SPUs, 112 TAUs, and 24 ROPs.

Compare that to the Radeon HD 6850, which comes with GPU core speed of 775 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 256-bit bus. It also is comprised of 960 SPUs, 48 TAUs, and 32 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 6850 2395 points
Difference: 3618 (151%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6850 127 Watts
GeForce GTX 660 Ti 150 Watts
Difference: 23 Watts (18%)

Memory Bandwidth

Performance-wise, the GeForce GTX 660 Ti should theoretically be a bit superior to the Radeon HD 6850 in general. (explain)

GeForce GTX 660 Ti 144000 MB/sec
Radeon HD 6850 128000 MB/sec
Difference: 16000 (13%)

Texel Rate

The GeForce GTX 660 Ti is a lot (more or less 175%) more effective at texture filtering than the Radeon HD 6850. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 65280 (175%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6850 is the winner, though not by far. (explain)

Radeon HD 6850 24800 Mpixels/sec
GeForce GTX 660 Ti 21960 Mpixels/sec
Difference: 2840 (13%)

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

Check prices at:

Radeon HD 6850

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 6850
Manufacturer nVidia AMD
Year August 2012 October 2010
Code Name GK104 Barts Pro
Memory 2048 MB 1024 MB
Core Speed 915 MHz 775 MHz
Memory Speed 6000 MHz 4000 MHz
Power (Max TDP) 150 watts 127 watts
Bandwidth 144000 MB/sec 128000 MB/sec
Texel Rate 102480 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 1344 960
Texture Mapping Units 112 48
Render Output Units 24 32
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 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of information (in units of megabytes per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most 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 amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce GTX 660 Ti

Amazon.com

Check prices at:

Radeon HD 6850

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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