Re: Is alienware M18X R2 can support up to GTX 680M SLI and above?
No, you won't be able to upgrade! GTX 660M and GTX 675M are not really new graphics cards because the are still produced in 45 nm process. The new GTX 680M will be the first from the "Kepler" series which are produced in 28 nm process. Thus, new motherboards are required to support the new chipset.