OK it seems that one will only support up to the E6xxx dual cores. The quad will not work.
Try and find this :
http://ark.intel.com/products/42805
Although keep in mind there is NO guarantee it will work. But I am willing to bet it will.
As for quad VS dual, games like fast clocked dual cores more than quads because they are not always capable of running on more than 2 cores. This is changing slowly but right now it still does not make sense to go for a quad in an extreme low cost PC. Unless ofcourse you play certain well multithreaded games.