GeForce 8800 GTS (G80) 640MB vs GeForce GTX 980M

Intro

Compare all that to the GeForce GTX 980M, which has a GPU core clock speed of 1038 MHz, and 4096 MB of GDDR5 RAM running at 1000 MHz through a 256-bit bus. It also features 1536 SPUs, 96 TAUs, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 980M		100 Watts
GeForce 8800 GTS (G80) 640MB		143 Watts
	Difference: 43 Watts (43%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 980M should theoretically be much superior to the GeForce 8800 GTS (G80) 640MB overall. (explain)

GeForce GTX 980M		128000 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 64640 (102%)

Texel Rate

The GeForce GTX 980M will be much (about 305%) faster with regards to anisotropic filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce GTX 980M		99648 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 75024 (305%)

Pixel Rate

The GeForce GTX 980M will be much (about 547%) more effective at full screen anti-aliasing than the GeForce 8800 GTS (G80) 640MB, and capable of handling higher resolutions while still performing well. (explain)

GeForce GTX 980M		66432 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 56172 (547%)

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 (measured in MB per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher 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 processed per second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. 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 also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.