GeForce GTX 260 216SP 55 nm vs GeForce GTX 850M

Intro

Compare all of that to the GeForce GTX 850M, which makes use of a 28 nm design. nVidia has set the core speed at 876 MHz. The DDR3 RAM works at a frequency of 1000 MHz on this model. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce GTX 260 216SP 55 nm		171 Watts
	Difference: 131 Watts (328%)

Memory Bandwidth

The GeForce GTX 260 216SP 55 nm should theoretically be much faster than the GeForce GTX 850M overall. (explain)

GeForce GTX 260 216SP 55 nm		111888 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 79888 (250%)

Texel Rate

The GeForce GTX 260 216SP 55 nm should be just a bit (approximately 18%) faster with regards to anisotropic filtering than the GeForce GTX 850M. (explain)

GeForce GTX 260 216SP 55 nm		41472 Mtexels/sec
GeForce GTX 850M		35040 Mtexels/sec
	Difference: 6432 (18%)

Pixel Rate

The GeForce GTX 260 216SP 55 nm will be a small bit (approximately 15%) more effective at anti-aliasing than the GeForce GTX 850M, and also should be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 260 216SP 55 nm		16128 Mpixels/sec
GeForce GTX 850M		14016 Mpixels/sec
	Difference: 2112 (15%)

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 data (measured in MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the 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 video card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.