For those who will try putting in an extra card rather than the latest bigger gpu card.
There has been a lot of negativity regarding sli, and its justified. However that does not mean you should avoid it.
Heres why, using my NZD gtx 670, using cuda cores for performance comparisons
two 670's 500 (original purchase) + 250 (ebay going rate + extra so seller will ship international) == 750nzd, 2670 cudas one 780 800 (in local pc store) + 500 (original purchase) - 150 (ebay going rate - international shipping) == 1150nzd, 2300 cudas
sli, is a good choice, except it needs to be carefully applied. I have to go ebay as local NZ and OZ online trader group is too small. Regarding warrantees, they are for DOA boards mainly. I hope boards are not thrashed to an early grave.
So here's a thread on the tips and guidelines.
Please put in links and summaries of tips read in magazines.
You are optimistic and I really hope you get SLi to work well enough with DK2 🙂 but the general consensus was that SLi introduced too much latency / lag and it just didn't work properly... hope in the future a software solution does turn up 😉
I sold my pair SLi 560ti oc's and didn't get much on ebay but I am really happy I did as the 780oc I picked up goes well 8-)
OK so lets kill off this thread with an explanation of the latency issue. What is it and is it fixable? It seems strange with multi-sli's doing their super high fps reason for being in recent full feature games.
for quad sli eg two gtz 690s, quad-sli ports ... there is a secret to doing it correctly. No all connector placements work well (ie the displayport or hdmi cable can go in 1st dvi, 2nd dvi, 3rd dvi, single DP, where 1st is bottom left, 2nd right? 3rd top? looking into card end. )
So the correct connectors to use are the 2nd, 3rd or the DP. Any other plugin can lead to unstable behaviour that most experienced builders will attribute to a bad PSU,bad RAM or other hardware issue. These avoid random lockups related to an improper configuration.