GeForce GTX 285 1GB vs GeForce GTX 850M

Intro

Compare all that to the GeForce GTX 850M, which uses a 28 nm design. nVidia has set the core frequency at 876 MHz. The DDR3 memory works at a speed of 1000 MHz on this model. 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 GTX 285 1GB		204 Watts
	Difference: 164 Watts (410%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 285 1GB should in theory be a lot better than the GeForce GTX 850M in general. (explain)

GeForce GTX 285 1GB		158976 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 126976 (397%)

Texel Rate

The GeForce GTX 285 1GB is quite a bit (approximately 48%) faster with regards to texture filtering than the GeForce GTX 850M. (explain)

GeForce GTX 285 1GB		51840 Mtexels/sec
GeForce GTX 850M		35040 Mtexels/sec
	Difference: 16800 (48%)

Pixel Rate

The GeForce GTX 285 1GB will be much (approximately 48%) more effective at anti-aliasing than the GeForce GTX 850M, and also will be able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 285 1GB		20736 Mpixels/sec
GeForce GTX 850M		14016 Mpixels/sec
	Difference: 6720 (48%)

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 maximum amount of data (in units of MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.