SLI is stil problematic as far im know, need to be sigle card. But, im tested a Core i3 2,5 Ghz (dual core-4thread) with Geforce 630M on my test scene and it reconstructed like my 4x 4Ghz Phenon II with Geforce 560Ti or even faster by few seconds.... will test it deeper, so it seemd that Pscan CAN use the 680 and it will be faster that 580 with a interesant margin...... will ltry to test on some 6xx series GPU