GeForce GTX 285 2GB vs GeForce GTX 870M

Intro

Compare those specs to the GeForce GTX 870M, which has core clock speeds of 941 MHz on the GPU, and 1000 MHz on the 3072 MB of GDDR5 memory. It features 1344 SPUs along with 112 Texture Address Units and 24 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 870M		110 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 94 Watts (85%)

Memory Bandwidth

The GeForce GTX 285 2GB should theoretically perform much faster than the GeForce GTX 870M in general. (explain)

GeForce GTX 285 2GB		158976 MB/sec
GeForce GTX 870M		96000 MB/sec
	Difference: 62976 (66%)

Texel Rate

The GeForce GTX 870M is a lot (more or less 103%) better at texture filtering than the GeForce GTX 285 2GB. (explain)

GeForce GTX 870M		105392 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 53552 (103%)

Pixel Rate

The GeForce GTX 870M will be a bit (approximately 9%) better at anti-aliasing than the GeForce GTX 285 2GB, and should be able to handle higher screen resolutions better. (explain)

GeForce GTX 870M		22584 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 1848 (9%)

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 largest amount of information (in units of megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 per second. This number is worked out by multiplying the total amount of texture units by the core 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 the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few 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.