Do not have anything to do with this seller - they are the biggest scam artists I have come across. They sell you fake RAM and then try to get you to say that you have not paid for the item and give them feedback. I will take this as far as I have to to get a refund out of them.
All you have to do is google smilentango or Jessica Khattar to find out how they have scammed hundreds of people if not thousands. I am going to report this to the Californian police as the US now have very strong laws against internet fraud.