Disabling 2 FX 4100 Cores

I just disabled 2 of my FX 4100's cores, which allowed me to get it up to 4.6GHz (will try 5GHz) on stock cooling with comfortable temps (52C max running Prime 95). I play older games, most of which will never use more than 2 cores. Specifically, which programs would be harmed by my disabling? Would this harm the CPU at all? It is not a true Quad core, so disabling it must help it out in per core performance too. How MUCH better would a 5GHz FX 4100 with 2 cores disabled be than a 4.2GHz FX 4100 with all of it's cores? It does help out those games in loading times drastically, even more than my SSD did. If it just effects Winrar then whatever.

Games I play:
Simcity 4 Deluxe Edition
Civilization IV +EPs
Sims 2+All EPs
Doom 3 BFG Edition
Star Wars Battlefront
Star Wars Battlefront II

Thanks