GeForce GTX 275 vs GeForce GTX 880M

Intro

Compare all that to the GeForce GTX 880M, which has GPU core speed of 954 MHz, and 4096 MB of GDDR5 memory running at 1000 MHz through a 256-bit bus. It also features 1536 Stream Processors, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 880M		130 Watts
GeForce GTX 275		219 Watts
	Difference: 89 Watts (68%)

Memory Bandwidth

Performance-wise, the GeForce GTX 880M should theoretically be a small bit better than the GeForce GTX 275 in general. (explain)

GeForce GTX 880M		128000 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 992 (1%)

Texel Rate

The GeForce GTX 880M should be much (more or less 141%) faster with regards to AF than the GeForce GTX 275. (explain)

GeForce GTX 880M		122112 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 71472 (141%)

Pixel Rate

The GeForce GTX 880M is quite a bit (more or less 72%) faster with regards to anti-aliasing than the GeForce GTX 275, and also capable of handling higher resolutions better. (explain)

GeForce GTX 880M		30528 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 12804 (72%)

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 maximum amount of information (counted in MB per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, 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 texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total number of texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.