GeForce 8800 GTS (G80) 640MB vs GeForce GTX 970

Intro

Compare those specs to the GeForce GTX 970, which comes with a core clock speed of 1050 MHz and a GDDR5 memory frequency of 1750 MHz. It also features a 256-bit memory bus, and uses a 28 nm design. It is made up of 1664 SPUs, 104 Texture Address Units, 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 970		145 Watts
	Difference: 2 Watts (1%)

Memory Bandwidth

The GeForce GTX 970, in theory, should be a lot faster than the GeForce 8800 GTS (G80) 640MB in general. (explain)

GeForce GTX 970		224000 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 160640 (254%)

Texel Rate

The GeForce GTX 970 should be a lot (approximately 343%) faster with regards to texture filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce GTX 970		109200 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 84576 (343%)

Pixel Rate

The GeForce GTX 970 is quite a bit (about 555%) faster with regards to full screen anti-aliasing than the GeForce 8800 GTS (G80) 640MB, and should be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GTX 970		67200 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 56940 (555%)

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 transported across the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core 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 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 maximum fill rate.