SLi bandwith

[zipo244]

hi im running a corsair tx750w modular psu powering two gtx titan blacks they are currently running in 8x how much of a increase in performance if they run in 16x 

[Deddie]

hi im running a corsair tx750w modular psu powering two gtx titan blacks they are currently running in 8x how much of a increase in performance if they run in 16x 

No difference.

[Oshino Shinobu]

Yep, no difference.

[SeanBond]

http://www.pugetsystems.com/labs/articles/Impact-of-PCI-E-Speed-on-Gaming-Performance-518/

 

Short answer, none. But if that's not good enough look at this^

[totjup5]

Almost zero difference whatsoever.