GeForce GTX 660 vs GeForce GTX 880M

Intro

Compare that to the GeForce GTX 880M, which has a core clock frequency of 954 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It features 1536 SPUs, 128 TAUs, and 32 Raster Operation Units.

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 880M		6360 points
GeForce GTX 660		5063 points
	Difference: 1297 (26%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 880M		130 Watts
GeForce GTX 660		140 Watts
	Difference: 10 Watts (8%)

Memory Bandwidth

In theory, the GeForce GTX 660 is 13% faster than the GeForce GTX 880M in general, because of its greater bandwidth. (explain)

GeForce GTX 660		144192 MB/sec
GeForce GTX 880M		128000 MB/sec
	Difference: 16192 (13%)

Texel Rate

The GeForce GTX 880M should be quite a bit (more or less 56%) faster with regards to texture filtering than the GeForce GTX 660. (explain)

GeForce GTX 880M		122112 Mtexels/sec
GeForce GTX 660		78400 Mtexels/sec
	Difference: 43712 (56%)

Pixel Rate

The GeForce GTX 880M should be a lot (about 30%) faster with regards to FSAA than the GeForce GTX 660, and will be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 880M		30528 Mpixels/sec
GeForce GTX 660		23520 Mpixels/sec
	Difference: 7008 (30%)

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 (measured in megabytes per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.