Also, what is a good way to test whether readyboost help my PC or not?
Turn off your computer. Time how long it takes to shut off. Turn on your computer. Time how long it takes to boot. Then open several programs, one after the other, and time how long they each take to start.
Plug in your flash drive (or memory card), and configure Windows to use it for Readyboost.
Now repeat the previous steps (off, on, open programs), recording the times it takes for all of these operations with Readyboost. Comparing the times should give you an idea of approximately how beneficial Readyboost is in your situation. There is also a value to how fast something "feels". So use your computer for awhile with Readyboost, and see if you notice anything generally. Like I said, I do, but I have half the RAM of your system. Even if Readyboost doesn't help much, it certainly won't hurt!