GeForce 8800 GS vs GeForce GTX 850M

Intro

Compare all of that to the GeForce GTX 850M, which features core speeds of 876 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce 8800 GS		105 Watts
	Difference: 65 Watts (163%)

Memory Bandwidth

In theory, the GeForce 8800 GS is 20% quicker than the GeForce GTX 850M in general, because of its greater bandwidth. (explain)

GeForce 8800 GS		38400 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 6400 (20%)

Texel Rate

The GeForce GTX 850M is quite a bit (more or less 33%) more effective at texture filtering than the GeForce 8800 GS. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce 8800 GS		26400 Mtexels/sec
	Difference: 8640 (33%)

Pixel Rate

The GeForce GTX 850M should be a lot (approximately 112%) more effective at FSAA than the GeForce 8800 GS, and also should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce 8800 GS		6600 Mpixels/sec
	Difference: 7416 (112%)

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 max amount of information (in units of megabytes per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many 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.