GeForce GTX 285 1GB vs GeForce GTX 850M

Intro

Compare those specifications to the GeForce GTX 850M, which uses a 28 nm design. nVidia has set the core frequency at 876 MHz. The DDR3 RAM works at a frequency of 1000 MHz on this particular card. It features 640 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

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

Theoretically, the GeForce GTX 285 1GB should perform a lot faster than the GeForce GTX 850M overall. (explain)

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

Texel Rate

The GeForce GTX 285 1GB should be quite a bit (about 48%) faster with regards to AF than the GeForce GTX 850M. (explain)

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

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 285 1GB is a better choice, by a large margin. (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: Bandwidth is the maximum amount of data (in units of MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 are applied in one second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, 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 the video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour 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 rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.