massa902 :
well I it is probably over 80% full right now after all the pragroms updates and drivers I have put on it now....But I am sure the 120gb will be more than enough room. But I got the KHX SSD for more performance than anything...Even though my current setup using win 8 pro is still fast, But the new SSD was on sale for like $90 including the upgrade box so I could not resisit....So I really want it to be my C drive.
A fresh install of Windows on the new drive would be the best way to go. Before you do though, go into your BIOS and be sure that SATA Mode is set to AHCI and not IDE nor RAID. Also, be sure to disconnect your existing drive(s) before you do the install, otherwise, Windows may put some of the boot files on the other drive. During the installation when you partition the new drive only make the partition 96 GB (120 X .80) and leave the rest of the drive as unallocated. This will allow the drive to have some over-provisioning from the start and it will provide better long term performance.
After installing Windows, all its updates and driver updates, shut down and reconnect your existing drives. Check the boot order in the BIOS and be sure that your new drive is 2nd from the top, behind your optical drive.
Alternatively, you could try the data migration software which typically comes with a new SSD to clone your existing C: drive to the new SSD. That is what I did when installing my Samsung 840 Pro SSD. Just be sure that you update the cloning software to the latest version and partition the drive as recommended above.
The results obtained with cloning software are not always good and some are better than others. I had a good experience but yours may be different and a fresh install is always the best.
Good luck!
Yogi