Played some more with AMD's Fusion for Gaming...
I wrote that it allows access to Catalyst profiles. That is not true. Instead it gives access to the Catalyst Auto Tune functionality.
I've also made some mistakes below earlier, that I have corrected later. The software is new and there's not much documentation, so it is trial on error. But the info below is probably accurate.
I am not sure if this app works on AMD's Phenom only, but I wouldn't be surprised when that was the case.
The hardware options also give access to Catalyst Auto Tune and AMD Overdrive. These options are only interesting for overclockers. However, be carefull with those it can make your system unstable. Real overclockers use the BIOS and often have special tools for overclocling graphics cards. Those are not interested in these options either.
It allows you to use AMD Boost. That can switch off Cool'n'Quiet and power-state switching which will improve performance. Usually these options are available in the BIOS only.
It also allows you to switch on hard disk drive acceleration. That also disables their power saving mode.
In Vista there are two places where you can play with services:
1) Running "Services" from the "Administrative Tools".
2) Running "MSConfig.exe" by typing "MSConfig" (without the quotes) on the Start Menu.
Of course these two have nothing to do with AMD's Fusion.
Option #2 is handy, because it will tell you when you have disabled a given service or start-up application. This allows you to experiment and rollback features you have disabled. Very nice.
AMD's Fusion has less options than MSConfig, but it does allow you to have different profiles. Each one is accessible by a name. The three default profiles are safe and don't have extreme memory and thread improvements, but you can add your own. This is also a handy tool to experiment with. If you switch off the profile it will enable all services you disabled in the profile. So, be careful what to disable. Check "Services" found in "Administrative Tools" to see what services are actually running. Disabling a service in a profile, that was already stopped will start it if it wasn't disabled. I think it is saver to experiment with Fusion than the "Services" and "MSConfig" applets, because you can always disable the profile and reboot to return to your safe configuration when you screw up.
Fusion provides you with options to switch off the start-up applications for the current user and/or for all users.
It prevents some services to be disabled. I think they do that to be sure that the basic services required to keep your machine running will not be killed.
It doesn't allow third party services (i.e. non-Microsoft services) to be stopped. No idea why. Maybe that will be available in later releases, Or maybe they don't want to fiddle with third party stuff. Legal rights or too complex to test?
Another advantage is that it doesn't require you to reboot. That means that it takes a while for the services to stop. It can cause a temporary increase in memory and threads, but that will soon fade away and the improvements will kick in. The same applies to when you disable a profile. It takes time for the stuff you disabled to get enabled and that starting up can increase thread and memory usage, but that will return to normal after everything has been initialized.
If you already tweaked your system using "Services" and/or "MSConfig" then there is not much that Fusion can improve.