GeForce GTX 465 vs Geforce GTX 680

Intro

Compare all that to the Geforce GTX 680, which comes with a GPU core clock speed of 1006 MHz, and 2048 MB of GDDR5 RAM set to run at 1502 MHz through a 256-bit bus. It also features 1536 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 680		195 Watts
GeForce GTX 465		200 Watts
	Difference: 5 Watts (3%)

Memory Bandwidth

As far as performance goes, the Geforce GTX 680 should in theory be quite a bit better than the GeForce GTX 465 overall. (explain)

Geforce GTX 680		192256 MB/sec
GeForce GTX 465		102592 MB/sec
	Difference: 89664 (87%)

Texel Rate

The Geforce GTX 680 is a lot (more or less 382%) better at texture filtering than the GeForce GTX 465. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 102060 (382%)

Pixel Rate

The Geforce GTX 680 is quite a bit (more or less 66%) more effective at anti-aliasing than the GeForce GTX 465, and should be capable of handling higher screen resolutions better. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce GTX 465		19424 Mpixels/sec
	Difference: 12768 (66%)

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 megabytes per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. 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 amount of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the 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 amount of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.