GeForce 8800 GTS (G80) 640MB vs GeForce GTX 650

Intro

Compare those specifications to the GeForce GTX 650, which features a GPU core clock speed of 1058 MHz, and 1024 MB of GDDR5 RAM set to run at 1250 MHz through a 128-bit bus. It also is made up of 384 Stream Processors, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce 8800 GTS (G80) 640MB		143 Watts
	Difference: 79 Watts (123%)

Memory Bandwidth

The GeForce GTX 650 should in theory perform quite a bit faster than the GeForce 8800 GTS (G80) 640MB overall. (explain)

GeForce GTX 650		80000 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 16640 (26%)

Texel Rate

The GeForce GTX 650 will be much (about 37%) more effective at AF than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce GTX 650		33856 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 9232 (37%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 650 is superior to the GeForce 8800 GTS (G80) 640MB, and very much so. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 6668 (65%)

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 largest amount of data (measured in megabytes per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core 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 output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.