will this work with gigabyte z390 aorus ultra?

yes it will 2666 feq ram and works fine as dose most ddr4 ram in that mobo

is it compatible with X399?

Yes, it should be! I believe the motherboard type you're referring to is for AMD ThreadRipper processors, right? If so, yes. I read that it takes 288-pin DIMM, so this would work. =]

Questions & Answers: CORSAIR Vengeance RGB Pro 64GB (4 x 16GB) DDR4 2666 (PC4 21300) Desktop Memory Model CMW64GX4M4A2666C16

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CORSAIR Vengeance RGB Pro 64GB (4 x 16GB) DDR4 2666 (PC4 21300) Desktop Memory Model CMW64GX4M4A2666C16

DDR4 2666 (PC4 21300)
Timing 16-18-18-35
CAS Latency CL16
Voltage 1.20V

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