1) Faster boot and load times on programs. Yes, it's the same for the 1TB and 750GB but the performance gain is more noticeable when upgrading from the 5400RPM drives than the 7200RPM drives.
2) John_from_ohio has a thread around here somewhere that outlines the steps he took to set up his rig. I personally did the following:
- I installed my Crucial M4 SSD to the open drive bay and powered on my computer. The system detected the SSD as a new drive and proceeded to install drivers. The new SSD wasn't formatted, so from Windows I formatted it. I then powered down the computer.
- I disconnected the built in drive (1TB) and moved the SSD to the slot the 1TB was previously in and powered up my computer and hit the ESC key to boot from the ASUS Recovery Discs I burned when I first unboxed the computer. You can reference my guide that I put together that's in my signature and in the Important and Useful sub-forum.
- Once my SSD was restored as the main, I connected the stock drive into the open drive bay and powered up and entered BIOS. I made sure to remove from the boot order the stock drive so there wasn't any boot conflicts. After saving the BIOS settings the stock drive shows up as a second hard drive.
- From windows I shrank the "OS" partition on the stock drive and created a new "DATA" partition. This way if there's a catastrophic failure on my SSD, I still have my stock drive ready to boot from (just need to change the boot order in BIOS).
3) Follow my guide for a clean factory install onto the SSD. You can uninstall whatever ASUS "bloatware" you deem fit for uninstallation once the process finishes (just don't by an OCZ SSD as apparently those drives have problems on a G75). I personally didn't uninstall anything on my system.