probably. assuming you mean quad 45nm on one die, and not 4x dual-core 45nm supporting motherboards. nvidia is getting bad pr for not releasing the SLi codes to intel. i doubt they can hold against it for a long time. (then again, they do make the best graphics cards on the market...)
Nvidia is coming out with new nForce chipsets for both AMD & Intel in the 780i motherboards that should be out mid Dec to mid January. Also they have released the 790i nforce motherboard for Intel using DDR3 ram that should be out by end of January 2008.
Nvidia does not want to play nice with Intel since they stand to loose alot wether by SLI license or not to Intel,chipset is a big deal right now .Intel,AMD and Nvidia is very guarded with there chipset ever since AMD bought ATI which believe it or not is very important to AMD survival,something I think they saw