I don't know if this is the correct place for this message. Please apology if I mistake.
Wanting to upgrade the RAM capacity of my Aspire X-730 from 4 to 8 GB, I didn't find any information on acer.com, despite this is a very common operation. So, I looked at other sites from the net, then ordered a DDR 3 4GB 1600, not available locally. When I received the parcel, I found that it had not the correct slot and pinout characteristics. Arguing that he had delivered the product I had ordered - which was true -, the supplier refused to take back the part.
This inconvenience aside, I have the feeling that this type of problem is likely to occur with all ACER product I could buy, due to insufficient user information. So I think that I shall never purchase any ACER computer in future.
[Edited the thread to add issue detail]