GeForce GTX 285 2GB vs GeForce GTX 980M

Intro

Compare those specs to the GeForce GTX 980M, which has core clock speeds of 1038 MHz on the GPU, and 1000 MHz on the 4096 MB of GDDR5 RAM. It features 1536 SPUs along with 96 Texture Address Units and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 980M		100 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 104 Watts (104%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 285 2GB should theoretically be quite a bit better than the GeForce GTX 980M overall. (explain)

GeForce GTX 285 2GB		158976 MB/sec
GeForce GTX 980M		128000 MB/sec
	Difference: 30976 (24%)

Texel Rate

The GeForce GTX 980M should be much (approximately 92%) more effective at AF than the GeForce GTX 285 2GB. (explain)

GeForce GTX 980M		99648 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 47808 (92%)

Pixel Rate

The GeForce GTX 980M will be quite a bit (approximately 220%) faster with regards to anti-aliasing than the GeForce GTX 285 2GB, and will be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 980M		66432 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 45696 (220%)

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 information (in units of MB per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher 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 number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.