GeForce GTX 660 Ti vs Radeon HD 6850

Intro

Compare those specs 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 features 960 SPUs, 48 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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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

In theory, the GeForce GTX 660 Ti should be 13% quicker than the Radeon HD 6850 in general, because of its greater bandwidth. (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 quite a bit (about 175%) faster with regards to anisotropic 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

The Radeon HD 6850 should be a little bit (about 13%) better at AA than the GeForce GTX 660 Ti, and able to handle higher resolutions while still performing well. (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

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video 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 maximum number of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output 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 reach the max fill rate.