GeForce GTS 150 vs GeForce GTX 660 Ti

Intro

Compare those specifications to the GeForce GTX 660 Ti, which uses a 28 nm design. nVidia has set the core speed at 915 MHz. The GDDR5 memory is set to run at a speed of 1500 MHz on this particular model. It features 1344 SPUs as well as 112 TAUs and 24 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 150		141 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 9 Watts (6%)

Memory Bandwidth

The GeForce GTX 660 Ti should theoretically be much faster than the GeForce GTS 150 overall. (explain)

GeForce GTX 660 Ti		144000 MB/sec
GeForce GTS 150		32000 MB/sec
	Difference: 112000 (350%)

Texel Rate

The GeForce GTX 660 Ti should be much (approximately 116%) faster with regards to AF than the GeForce GTS 150. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
GeForce GTS 150		47360 Mtexels/sec
	Difference: 55120 (116%)

Pixel Rate

The GeForce GTX 660 Ti will be quite a bit (about 85%) faster with regards to full screen anti-aliasing than the GeForce GTS 150, and will be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
GeForce GTS 150		11840 Mpixels/sec
	Difference: 10120 (85%)

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 megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better 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 number of pixels that the graphics card could 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 card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.