Not to be negative, but those "tweaks" only have limited potential. Game devs know that by default their game can't use more than 2GB of memory, so even if you increase the max addressable memory space for a game to 3GB, it probably will never use the extra gig anyway. It can however cure BSODs caused by apps exceding the 2GB limit. For example, this is a problem with Supreme Commander with a
lot of units in the field.
Same thing with PAE: gaming PCs typically have either 2GB or 4GB; 2x1GB, 4x1GB or 2x2GB (matched pairs for memory). With 2GB total it's a non issue. With 4GB it helps address all installed memory (though, like mentioned, it can lead to compatibility issues), but even without PAE you can use at least 3 of 4GB: 2GB for the game and at least 1GB left for OS. Why mess with it and risk trouble?
It really only serves it's purpose in cases like Supreme Commander:
1. Game crashes because app exceeds it's max space.
2. Use "tweak" so the app can address more space.
3. Now the app can use all 3GB of available memory, "fighting" the OS for that 3rd gig.
4. Use PAE to address all available memory.
5. Now the app can use 3GB while still leaving 1GB for OS.
At least that's how I understand it, I haven't done this stuff in practice yet.
