GeForce GTS 150 vs GeForce GTX 660

Intro

Compare those specs to the GeForce GTX 660, which has a core clock frequency of 980 MHz and a GDDR5 memory frequency of 1502 MHz. It also makes use of a 192-bit bus, and makes use of a 28 nm design. It is comprised of 960 SPUs, 80 TAUs, and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660		140 Watts
GeForce GTS 150		141 Watts
	Difference: 1 Watts (1%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 is 351% quicker than the GeForce GTS 150 in general, due to its greater data rate. (explain)

GeForce GTX 660		144192 MB/sec
GeForce GTS 150		32000 MB/sec
	Difference: 112192 (351%)

Texel Rate

The GeForce GTX 660 should be quite a bit (about 66%) faster with regards to anisotropic filtering than the GeForce GTS 150. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce GTS 150		47360 Mtexels/sec
	Difference: 31040 (66%)

Pixel Rate

The GeForce GTX 660 should be quite a bit (more or less 99%) more effective at anti-aliasing than the GeForce GTS 150, and also will be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce GTS 150		11840 Mpixels/sec
	Difference: 11680 (99%)

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 (counted in MB per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it should 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 texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics 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 amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.