Corsair DDR3 RAM SO CMSO4GX3M1A1333C9 1333 4GB CL9 COR (Personal Computers)
RAM is recognized immediately Vaio laptop, so I spent 2 + 2 + 1 go to 4 GB (2 ports available) 2 go still reserve for the max, but already a very big improvement in intensive use, the processor no longer mouline and fan too, 2nd purchase Corsair bran