I have an U550 lenovo notebook and have some questions: 1- I have a U7300 1.30 CPU, can i upgrade the CPU without soldering? and if yes does it worth it? will i see any improvement in Performance? 2- Also can i upgrade the HDD and to which you recommend? 3- Ram: installed 4GB and max is 8GB, upgrade or not necessary? 4- The bios don't give much of an options to change, is it every notebook or there is hidden options? like in Gigabyte motherboards if u press CTRL+F1?