After superfast Amazon Versant they were there - the longed-8GB DDR3 RAM ... Unwrapped, installed and first disillusionment! The memory was not working properly, at 1333MHz (1600MHz @ default) could boot Windows ever, but crashed every few minutes with bluescreen "Memory Manage- ment," -> the memory has always been broken. So reclaims the package from Amazon and unceremoniously hung two days later, a new set of memory into the house, this works perfectly and is much faster than my previous 2x2GB 1333MHz bar!
For buyers with a little more RAM hungry, I would recommend a double set (16GB), along the lines of what you have has one and it is also used!
For memory full 5 stars, only one is withdrawn due to the faulty first set. For the Amazon support there 5 * star - just quick and convenient.