The thing is if you play Diplomacy you don't need to worry about the 2 gig problem anymore. As of the Diplomacy 1.2 patch IC fixed the 2 gig issue, and the game doesn't use more than 1.5 gigs. Max settings, any map. You really dont need TSOP, or any kind of ram fix for Diplomacy.
Entrenchment, and Original Sins is another story, because the Dip 1.2, and up fix's do not work in ether of the two previous versions of Sins. The Ironclad 2 gig fix works on Diplomacy ONLY. So Entrenchment, and SotSE still have the same 2 gig issue as before, because they were never updated. You will need TSOP to play those two versions if you get a lot of dumps, or have 2 gigs of ram, or less.