I currently bought a brand new HP Z640 Workstation with 1 CPU and try to enlarge the memory of 32GB (4x 8GB 1Rx4 PC4-2133P-R) to 128GB (4x 32GB 2Rx4 PC4-2133P-L).
I have a problem with these 4x 32GB memories: The two rear fans made a big noise. I found that the fans rotated about 2000 rpm.
When I restore these 4x 8GB memories, the Z640 is quiet again. I have also tried with 4x 32GB 2Rx4 PC4-2133P-R (RDIMM). The same problem of noise comes again.
Has anybody the experience?
Thank in advance.