Some models come with 4GB modules, and some with 2GB, so in your case, you have 2 empty slots on the flip side of the motherboard. These are accessed by deconstructing the case to get to the motherboard.
As for upgrade options, you can get 2 4GB DDR3-1333 modules to get to 16GB. If you want increased performance, you can get faster memory modules, but you would need to replace the 8GB you have now. You'd be looking at Kingston's PnP Memory, which is available in 1600, 1833, and 2133 speeds. It'll be pricey, but if you were ever interested in getting faster ram, now is the time to do it.
As for a SSD, the "thing" you were talking about was disabling C-states to get the fastest SSD speeds. However, this will mean your CPU and bus will be running full throttle all the time, and IMO is not worth the minor speed boost, and would kill your battery quicker, plus run your fans at higher rates constantly.
Most people when switching to a SSD will do a fresh install of Win 7 x64, since it makes it easy. You can clone your OS partition, and restore it to the SSD, but it would have to fit, so you may need to relocate a bunch of stuff first, and perhaps uninstall some apps. (I moved my Steam dir to my 2nd HDD, then had to reverify all my installed games)
You may also find this site helpful
🙂http://thessdreview.com/ssd-guides/optimization-guides/the-ssd-optimization-guide-2/
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