hay this is my bios setting and it stable for 24/7
i saw that when i change the CPU Uncore Frequency (Mhz)  to auto i get alot more score on MaxxMEM2 from my memory, but linx falls down. but when i use manual setting of 3221Mhz x16 my system is stable but MaxxMEM2 get lower score.
what does it do and how can i stable the system with more multipliers on the CPU Uncore frequency??
 
my bios:
Frequency Control
CPU Clock Ratio  ( 21X )
CPU Host Frequency (Mhz)  ( 201 )
Target CPU Frequency  4228Mhz  (201x21)
Target Memory Frequency  1610Mhz
MCH Strap  ( Auto )
CPU Uncore Frequency (Mhz)  ( 3221Mhz  x16 )
CPU Clock Skew ( 0 ps )
IOH Clock Skew ( 0 ps )
Spread Spectrum ( Disabled )
PCIE Frequency (Mhz) ( 100 )
OC Recovery ( Disabled )
Turbo Performance ( Disabled )
 
Memory Feature
Memory Speed ( Standart )
Memory Control Setting ( Enabled )
Memory Frequency ( 1067Mhz / 2:8 )
Target Memory Frequency  1610Mhz
Channel Interleave Setting ( 6 Way )
Rank Interleave Setting ( 4 Way )
Memory Low Gap ( Auto )
tCL Setting ( 8 )
tRCD Setting ( 8 )
tRP Setting ( 8 )
tRAS Setting ( 24 )
tRFC Setting ( 88 )
Command Rate ( 2T )
 
 
Voltage Control
EVGA VDroop Control ( Without VDroop )
CPU VCore ( 1.32500V )
CPU VTT Voltage ( +100mV )
CPU PLL VCore ( 1.275V )
IOH PLL VCore  ( 1.275V )
QPI PLL VCore   ( 1.100V )  
DIMM Voltage ( 1.610V )
DIMM DQ Vref ( +0mV )
IOH VCore ( Auto )
IOH/ICH I/O Voltage ( Auto )
ICH VCore  ( Auto )
VTT PWM Frequency ( 250 KHZ )
CPU PWM Frequency ( 940 KHZ )
CPU Impedance ( Auto)
QPI Signal Compensation ( Auto )
 
CPU Feature
Intel SpeedStep ( Disabled )
Turbo Mode Function (Disabled )
CxE Function ( Disabled )
Execute Disable Bit ( Disabled )
Virtualization Technology ( Disabled )
Intel HT Technology ( Enabled )
Active Processor Cores ( All )
QPI Control Settings ( Enabled )
QPI Link Fast Mode ( Enabled )
QPI Frequency Selection ( 4.800 GT/s ) 
 

thanks fafale. i am now standing on x19.
x20 do not boot windows so i am going to rasie the VTT a little bit,
do i need to raise the dimm voltage as well??

i see, so what the MCH strip does? do i need to set it to DRAM RATIO ?