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Has anyone else with a similar configuration had noticed this issue? Basically with both pumps on at their lowest setting I notice an oscillating vibration. Please see my signature for system hardware details.

I finally said screw it and killed the power to the second pump and while my flow drop 20 gal/h the cavitation went away. Even with the drop in flow rate I haven't noticed any impact on cooling. Granted, I could always increase the single pump speed using my controller and I imagine that if I remove the second non-powered pump flow would increase.

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Gaming Rig (R5E)
(17 items)
 
File Server
(13 items)
 
 
CPUMotherboardGraphicsRAM
Intel i7 6900K ASUS Rampage V Extreme Edition 10 (2) Titan X (Pascal; 2-way SLI) G.SKILL Trident Z 32GB 3200 Mhz 14-14-14-34-2N 
Hard DriveHard DriveOSMonitor
Samsung 950 PRO NVMe M.2 Internal SSD (OS & Apps) (2) 2TB Western Digital RE4 HDs (Games) Windows 10 Pro x64 34” ASUS ROG Swift PG348Q 
KeyboardPowerCaseMouse
Ducky Shine 3 Year of the Snake (CB Switches) SeaSonic 1200W SS-1200XP3 80 Plus Platinum PSU Case Labs TH10 Razer Naga 2014 
AudioAudioAudioOther
Parasound Zdac v.2 USB DAC (2) KRK Rokit 6 Monitors (XLRs to DAC) Sennheiser HD 650 Headphones APC SMT2200 UPS Tower 
CPUMotherboardRAMHard Drive
Intel Xeon E3-1230 3.2GHz SUPERMICRO MBD-X9SCM-F-O C204 Micro ATX Crucial 16GB DDR3 ECC (2) Western Digital RE4 250GB (RAID 1 - OS) 
Hard DriveHard DriveHard DriveOS
(4) 4TB Western Digital RE4 (RAID 10 - File Sto... Western Digital 1TB 10K VelociRaptor (Virtual M... 6TB HGST Deskstar (Backup) Windows Server 2012 R2 Standard 
PowerCaseOtherOther
CORSAIR 520W CMPSU-520HX  iStarUSA D400-6SE-BK 4U Rackmount Chassis w/ i...  Intel Ethernet Server Adapter I350-T4V2 Adaptec RAID 6805 2270100-R 6Gb/s SATA/SAS w/ 5... 
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APC SMT2200RM2U UPS 
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