GeForce GTX 660 Ti vs Radeon HD 5770

Intro

Compare those specs to the Radeon HD 5770, which comes with GPU clock speed of 850 MHz, and 1024 MB of GDDR5 memory set to run at 1200 MHz through a 128-bit bus. It also is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 42 Watts (39%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 Ti should theoretically be quite a bit superior to the Radeon HD 5770 in general. (explain)

GeForce GTX 660 Ti		144000 MB/sec
Radeon HD 5770		76800 MB/sec
	Difference: 67200 (88%)

Texel Rate

The GeForce GTX 660 Ti is much (approximately 201%) better at anisotropic filtering than the Radeon HD 5770. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 68480 (201%)

Pixel Rate

The GeForce GTX 660 Ti is a lot (about 61%) faster with regards to AA than the Radeon HD 5770, and also capable of handling higher resolutions while still performing well. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 8360 (61%)

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: Bandwidth is the max amount of data (measured in MB per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.