If you're sure about that upgrade (I can't tell if you need that extra RAM for your use of the machine) better find another shop.
I want to buy a new Sony Viao. The default is 4Gb RAM, upgradeable to 8Gb. It's been my experience that, when you want to upgrade RAM after a few years, vendors have all sorts of reasons that it can't be done, usually along the lines that the new RAM chips no longer fit the older machines.
So, I've told the shop that I want them to do the RAM upgrade at the time I purchase it (I'm obviously prepared to pay for the the extra RAM). They tell me that, because they are merely sellers, they can't do the upgrade, that it will have to be sent elsewhere to do this upgrade. Fair enough. Problem is, it then means that someone else has worked on the machine, and that immediately voids the warranty.
Is this right? If so, what's the point of having a computer that's RAM-upgradable?
Thanks in advance.