GeForce GTX 660 Ti vs Radeon HD 4770

Intro

Compare all that to the Radeon HD 4770, which features GPU core speed of 750 MHz, and 512 MB of GDDR5 memory running at 800 MHz through a 128-bit bus. It also is made up of 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 70 Watts (88%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 Ti should theoretically be a lot superior to the Radeon HD 4770 overall. (explain)

GeForce GTX 660 Ti		144000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 92800 (181%)

Texel Rate

The GeForce GTX 660 Ti will be a lot (approximately 327%) more effective at anisotropic filtering than the Radeon HD 4770. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 78480 (327%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 660 Ti is the winner, and very much so. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 9960 (83%)

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

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.