GeForce 940M vs GeForce GTX 660

Intro

Compare all that to the GeForce GTX 660, which features GPU core speed of 980 MHz, and 2048 MB of GDDR5 memory set to run at 1502 MHz through a 192-bit bus. It also features 960 Stream Processors, 80 TAUs, and 24 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 660		5063 points
GeForce 940M		1740 points
	Difference: 3323 (191%)

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce GTX 660 should theoretically perform quite a bit faster than the GeForce 940M in general. (explain)

GeForce GTX 660		144192 MB/sec
GeForce 940M		16000 MB/sec
	Difference: 128192 (801%)

Texel Rate

The GeForce GTX 660 will be quite a bit (approximately 205%) better at AF than the GeForce 940M. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce 940M		25728 Mtexels/sec
	Difference: 52672 (205%)

Pixel Rate

The GeForce GTX 660 is much (approximately 174%) more effective at FSAA than the GeForce 940M, and also will be able to handle higher resolutions better. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce 940M		8576 Mpixels/sec
	Difference: 14944 (174%)

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 data (counted in MB per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock 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 many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.