So I'm currently running an intel E6850 Dual core @ 3.00ghz, 8gigs of ram, 64bit vista and a Geforce 8600 GTS running 5 copies on WOW on dual monitors.

I upgraded the ram from 4 gigbs to 8 and saw some improvement but someone had suggested the dual core cpu may be a bottle neck.

I can keep my motherboard (which supports both 65 and 45 specs) and upgrade just the CPU to a Quad Q9400 @ 2.66ghz - http://www.tigerdirect.com/applicati...IN#detailspecs

So a lower speed but 4 instead of 2; what kind of performance boost do you think I'll see? A minor or a major improvement?

Thanks,

-Clov