I don't think there will be a 4000+ coming for socket 754m it's pretty much a dead platform. Since you are already running at 2.3ghz, and the 3700+ is 2.4ghz, running at stock you wouldn't get a huge improvement, not sure how well it would OC. You can probalby squeeze some more out of your 3000+ with a little vcore and maybe a better HSF if it gets too hot.