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

Intro

Compare those specifications to the GeForce GTX 980, which features GPU core speed of 1126 MHz, and 4096 MB of GDDR5 RAM set to run at 1750 MHz through a 256-bit bus. It also is made up of 2048 Stream Processors, 128 TAUs, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTS (G80) 640MB		143 Watts
GeForce GTX 980		165 Watts
	Difference: 22 Watts (15%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 980 should in theory be much better than the GeForce 8800 GTS (G80) 640MB overall. (explain)

GeForce GTX 980		224000 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 160640 (254%)

Texel Rate

The GeForce GTX 980 will be much (about 485%) better at AF than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce GTX 980		144128 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 119504 (485%)

Pixel Rate

The GeForce GTX 980 should be a lot (approximately 602%) more effective at anti-aliasing than the GeForce 8800 GTS (G80) 640MB, and also should be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 980		72064 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 61804 (602%)

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 (measured in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling 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 that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.