Yes it will support 64gb.
Thanks for your reply. By the way, have you used the lga2011 processor and tested it yourself. I have talked twice to intel support center, one chap says it is 32gb ram only as it is the limit for the processor while another chap says it will support 64gb but it will only process 32gb data set one at a time only, while the remaining 32gb will be sort of queued up for later processing. So I end up puzzling as to whether which chap is correct. I'm still waiting reply from ASUS as to whether they have tested their x79 rampage extreme iv motherboard can really use up to 64gb ram with the i7-3000s series processor, that eventually allow memory-intensive x64 bit software to work with large data set exceeding 32gb. I'm keeping my fingers across.