What to get: 690 or 2 x 680 ?

That's why the 2 x GTXx80 *always* comes out a touch quicker than the single card dual GPU solution. It has been that way since the days of the GTX280.

Just take a look at the link I posted on the last page (#34). The GTX 690 was a touch quicker than the 2x 680 setup....

I think you have a valid thought process, but this generation we are far from saturating the PCIe lanes in most situations. So the PLX in the 690 works to its advantage - *slightly*.
 
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