GeForce GTX 275 vs Geforce GTX 680

Intro

Compare all that to the Geforce GTX 680, which comes with core clock speeds of 1006 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 680		195 Watts
GeForce GTX 275		219 Watts
	Difference: 24 Watts (12%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 680 is 51% quicker than the GeForce GTX 275 overall, because of its higher data rate. (explain)

Geforce GTX 680		192256 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 65248 (51%)

Texel Rate

The Geforce GTX 680 will be quite a bit (approximately 154%) more effective at anisotropic filtering than the GeForce GTX 275. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 78128 (154%)

Pixel Rate

The Geforce GTX 680 should be much (more or less 82%) more effective at AA than the GeForce GTX 275, and able to handle higher screen resolutions without losing too much performance. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 14468 (82%)

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 (in units of MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's 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 texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its 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 clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends 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.