I pulled the trigger on the y550 custom build and got the 4GB RAM and 64-bit vista. I was wondering if I should downgrade to the 1x1 and get 2X2 off of newegg. The only reason I'd get it from newegg is if I could upgrade to 1366MHz. So my questions are: Can a notebook normally supplied with PC3-8500 DDR3 1066MHz support PC3-10666 DDR3 1366MHz? And would I see much of a difference between 4GB 1066MHz vs 4GB 1366MHz? I can get then both for about ~$70. http://www.newegg.com/Product/Produc...82E16820231215 Please excuse my ignorance, I am a notebook noob, just bought my first laptop after hours of research and decided y550 was the best deal.