Like tomatthe said, you won't get a framerate boost. You will, however, get dramatically improved load times in most games. Some games, The Old Republic being a notable example, have a CPU bottleneck in the load process, so an SSD won't improve those times.
Basically every other game sees a boost, though. In Skyrim, with my pitiful little Corsair Force 3 on a SATA II interface, no load took longer than two seconds. Fast travel to the other side of the world? Two seconds. Load into a dungeon? Two seconds. Run right back out? Two more seconds. It was crazy consistent, and absolutely wonderful to not have to deal with constant loads from that ancient engine.
Assembling a rig with a 128G SSD and 1TB 7200 RPM Mechanical Drive, so I'm wondering where I should install the game applications.
My preference is to install games onto the mechanical/storage drive, but I am wondering what sort of performance to expect between installing on either drive.
Hoping the main difference will simply be the load times.
You are buying a SSD, so use it. 128gb will hold the os and quite a number of games. Install the games you will play on the SSD. When the SSD starts to get full, remove the games you don't play much. Reinstall on the hard drive if you need to.
With 16gb, hibernation will take away a big chunk of the SSD. Google how to deactivate it and recover the space. Once used, it is a bit difficult to recover the space.
Link187 For this to actually work properly for vista users:
-Copy the game folder to the destination you want.
-DELETE the entire game folder from it's original location or the command will produce an error.
-run cmd.exe as administrator
use the command: mklink /J "C:\junction folder\game" "D:\actual folder\game"
it will create a folder where the old one was but it will have a little arrow thingy on the bottom left corner of the folder icon. Essentially a shortcut folder. Now you don't have to buy bigger hard drives or uninstall games or wait for steam to finally have this functionality built in.
This works in windows 7 too. Very easy to do and not that big of a pain.