1 of 1 people found this helpful
The FX 9590 officially supports up to 1866Mhz.
We recommend checking with the Motherboard manufacturer first to determine compatible system memory.
I get the answer from the professional support
our service request : SR # has been reviewed and updated.
Response and Service Request History:
As I understand you wish to know Fx 9590 support DDR3 2400 RAM. If I have missed out any critical information on your email please get back to me as my suggestions may change. But do not worry as am here to help you.
I confirm you that as per the FX 9590 specs below, Fx 9590 support does not support DDR3 2400 RAM and its support DDR3-1866 RAM.
I Hope the above suggestions will help you better and in case if you need any further assistance please do get back to me as I would be happy to help you out.
In order to update this service request, please respond, leaving the service request reference intact.
The keyword is "official", as AMD had to put a low rating because of the abundance of really horrid modules out there (Value RAM kind of stuff).