I decided to test my new CAS9 Dominator DDR3 2400 4x4GB RAM in another motherboard with different CPU to rule out CPU/mobo incompatibility. I got Rampage IV Extreme with E5-1650V2. XMP was enabled and VTT/VCSSA were left on Auto. VTT as reported by HWiNFO was around 1.25V, VCCSA ~1.18V. Windows Memory Diagnostic passed without errors. Prime95 custom 448-4096 with 14GB RAM allocation failed within minutes. I manually set 11-13-13-31 timings in BIOS and Prime95 custom ran for more 21 hours without any error.
As IMC on E5-1650V2 is capable of handing DDR3 2400 speed with 4 slots populated, I decided to retest my old CAS9 Dominator kit on Rampage IV Extreme and E5-1650V2. I manually set 11-13-13-31 timings. Prime95 custom 448-4096 failed in 9 hours and system suddenly rebooted in several minutes. So the memory controller of my E5-1680V2 was not at fault. It was the RAM itself.
My conclusion is that either Corsair pushed DDR3 chips to their limit and lax binning process allowed the chips to be barely stable to pass Memtest. Or the RAM chips degraded in several years of use.
As IMC on E5-1650V2 is capable of handing DDR3 2400 speed with 4 slots populated, I decided to retest my old CAS9 Dominator kit on Rampage IV Extreme and E5-1650V2. I manually set 11-13-13-31 timings. Prime95 custom 448-4096 failed in 9 hours and system suddenly rebooted in several minutes. So the memory controller of my E5-1680V2 was not at fault. It was the RAM itself.
My conclusion is that either Corsair pushed DDR3 chips to their limit and lax binning process allowed the chips to be barely stable to pass Memtest. Or the RAM chips degraded in several years of use.