GeForce GTX 660 vs Radeon RX 480 4GB

Intro

Compare those specifications to the Radeon RX 480 4GB, which features GPU clock speed of 1120 MHz, and 4096 MB of GDDR5 memory running at 1750 MHz through a 256-bit bus. It also is made up of 2304 Stream Processors, 144 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660		140 Watts
Radeon RX 480 4GB		150 Watts
	Difference: 10 Watts (7%)

Memory Bandwidth

Theoretically speaking, the Radeon RX 480 4GB is 59% quicker than the GeForce GTX 660 in general, because of its greater data rate. (explain)

Radeon RX 480 4GB		229376 MB/sec
GeForce GTX 660		144192 MB/sec
	Difference: 85184 (59%)

Texel Rate

The Radeon RX 480 4GB is a lot (about 106%) faster with regards to anisotropic filtering than the GeForce GTX 660. (explain)

Radeon RX 480 4GB		161280 Mtexels/sec
GeForce GTX 660		78400 Mtexels/sec
	Difference: 82880 (106%)

Pixel Rate

The Radeon RX 480 4GB will be much (approximately 52%) better at FSAA than the GeForce GTX 660, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon RX 480 4GB		35840 Mpixels/sec
GeForce GTX 660		23520 Mpixels/sec
	Difference: 12320 (52%)

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 max amount of information (counted in MB per second) that can be transferred past the external memory interface within a second. It is worked out 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 it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 is calculated by multiplying the total texture units by the core 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 the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. 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 also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.