GeForce GTX 285 2GB vs GeForce GTX 980M

Intro

Compare those specifications to the GeForce GTX 980M, which has GPU core speed of 1038 MHz, and 4096 MB of GDDR5 RAM running at 1000 MHz through a 256-bit bus. It also features 1536 Stream Processors, 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 in theory be quite a bit superior to 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 will be a lot (about 92%) more effective at anisotropic filtering 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

If using a high resolution is important to you, then the GeForce GTX 980M is a better choice, by a large margin. (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 data (measured in MB per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock speed of the card. 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 rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.