GeForce 8800 GTX vs GeForce GTX 870M

Intro

Compare all of that to the GeForce GTX 870M, which features core clock speeds of 941 MHz on the GPU, and 1000 MHz on the 3072 MB of GDDR5 RAM. It features 1344 SPUs along with 112 Texture Address Units and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 870M		110 Watts
GeForce 8800 GTX		155 Watts
	Difference: 45 Watts (41%)

Memory Bandwidth

The GeForce GTX 870M, in theory, should perform a little bit faster than the GeForce 8800 GTX in general. (explain)

GeForce GTX 870M		96000 MB/sec
GeForce 8800 GTX		86400 MB/sec
	Difference: 9600 (11%)

Texel Rate

The GeForce GTX 870M is much (about 186%) better at anisotropic filtering than the GeForce 8800 GTX. (explain)

GeForce GTX 870M		105392 Mtexels/sec
GeForce 8800 GTX		36800 Mtexels/sec
	Difference: 68592 (186%)

Pixel Rate

The GeForce GTX 870M should be much (approximately 64%) faster with regards to full screen anti-aliasing than the GeForce 8800 GTX, and also able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 870M		22584 Mpixels/sec
GeForce 8800 GTX		13800 Mpixels/sec
	Difference: 8784 (64%)

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 information (counted in MB per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total number of texture units of the card by the core 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can 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 Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.