GeForce GTX 275 vs GeForce GTX 880M

Intro

Compare those specs to the GeForce GTX 880M, which has a GPU core clock speed of 954 MHz, and 4096 MB of GDDR5 RAM set to run at 1000 MHz through a 256-bit bus. It also is made up of 1536 Stream Processors, 128 Texture Address Units, and 32 ROPs.

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

In theory, the GeForce GTX 880M should perform a small bit faster than the GeForce GTX 275 overall. (explain)

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

Texel Rate

The GeForce GTX 880M will be quite a bit (approximately 141%) more effective at anisotropic filtering 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 will be a lot (about 72%) better at full screen 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 data (measured in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 can be applied per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

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