132-bl-e758-A1
Corsair Vengeance 12gb (3x4gb)
800.0 MHz (DDR3-1600 / PC3-12800)
CMZ12Gx3M3A1600C9

Within a day of booting up the compooter. I find a full 4gb disappears from the 12gb I start with. All sticks are matching and settings set by selecting the XMP 1 profile.

Also I have added the tRL +2 for the
“Try +2 if RAM disappear when OC”

Here are most of the current bios settings

Frequency Control
CPU Clock Ratio ( 20X )
CPU Host Frequency (Mhz) ( 142 )
MCH Strap ( Auto )
CPU Uncore Frequency (Mhz) ( Auto )
CPU Clock Skew ( 0 ps )
IOH Clock Skew ( 0 ps )
Spread Spectrum ( Disabled )
PCIE Frequency (Mhz) ( 100 )
OC Recovery ( Disabled )
Turbo Performance ( Enabled )

Memory Feature
Memory Speed ( XMP Profile 1 )
Memory Control Setting ( Enabled )
Memory Frequency ( Auto )
Channel Interleave Setting ( 6 Way )
Rank Interleave Setting ( 4 Way )
Memory Low Gap ( Auto )
tCL Setting Au ( 9 )
tRCD Setting Au ( 9 )
tRP Setting Au ( 9 )
tRAS Setting Au ( 24 )
tRFC Setting Au ( 208 )
Command Rate Au ( 2t )

Voltage Control
EVGA VDroop Control ( With VDroop )
CPU VCore ( Auto )
CPU VTT Voltage ( Auto )
CPU PLL VCore ( Auto )
DIMM Voltage ( Auto )
DIMM DQ Vref ( +0mV )
QPI PLL VCore ( Auto )
IOH VCore ( Auto )
IOH/ICH I/O Voltage ( Auto )
ICH VCore ( Auto )
*PWM Frequency ( 800khz )

CPU Feature
Intel SpeedStep ( Enabled )
Turbo Mode Function ( Enabled )
CxE Function ( Auto )
Execute Disable Bit ( Enabled )
Virtualization Technology ( Disabled )
Intel HT Technology ( Enabled )
Active Processor Cores ( All )
QPI Control Settings ( Enabled )
QPI Link Fast Mode ( Enabled )
QPI Frequency Selection ( Auto )
OC Recovery ( Disabled )
Turbo Performance ( Enabled )

Any clue wat I need to modify to keep the 4gb from dropping?
Thanks For Your Time