Itīs a sensetive board this EP-45-UD3P, I have a hard time get this setup stable with my E8400 C0 and 2x1 Kingston HyperX PC9600.

450 9 4050 1200 555 15 tRD7 Turbo

I can run 50 loop LinX with 57% MCH ref and itīs stable but with Orthos blend it error after ~3min and with HCI memtest error after ~100%, Run 50 loop Harbor Assault with Crysis Benchmark Tool and it was okey with 57% MCH ref.

If I try any higher MCH ref then 57% LinX error with in 10min.

I try MCH ref 60% and Orthos blend have been running for 30min and is still running.

CPU Term lower then 1,28 LinX error within 30min.

If I run MCH higher then 1,48 LinX error within 10min and lower then 1,46 error within 20min.

I have Thermalright HR-05 SLI/IFX with a 80mm fan for the HCM so heat shouldnīt be a problem.

Sometimes when I restart it even boot up it just loop in keep booting or 2 or 3 reboots then all fans on but screen is black and I have to shut it down and restart and it starts with default BIOS setup (o man, itīs so annoying , never happens with any of my Asus board).

Any suggestings?

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GIGABYTE GA-EP45-UD3P BIOS F4 E8400 2x1 Kingston HyperX PC9600 1200 555 15 tRD7 Turbo

MB Intelligent Tweaker(M.I.T.) 
 
Robust Graphics Booster ..................: Auto
CPU Clock Ratio ..........................: 9 
Fine CPU Clock Ratio......................: 0 
CPU Frequency ............................: 4.05GHz (450x9)
  
Clock Chip Control  
Standard Clock Control  
CPU Host Clock Control....................: Enabled 
CPU Host Frequency (Mhz) .................: 450
PCI Express Frequency (Mhz) ..............: 100 
C.I.A. 2..................................: Disabled  

Advanced Clock Control 
CPU Clock Drive...........................: 700mv  
PCI Express Clock Drive...................: 700mv  
CPU Clock Skew (ps).......................: 0ps  
MCH Clock Skew (ps).......................: 0ps 
 
DRAM Performance Control  
Performance Enhance......................: Turbo 
MCH Frequency Latch......................: 200MHz 
System Memory Multiplier ................: 2.66C
Memory Frequency (Mhz) ..................: 1200  
DRAM Timing Selectable ..................: Manual

Standard Timing Control 
CAS Latency Time.........................: 5
tRCD ....................................: 5
tRP......................................: 5 
tRAS.....................................: 15  
Advanced Timing Control [Press Enter]  
tRRD.....................................: 3  [Auto]
tWTR.....................................: 3  [Auto]
tWR......................................: 6  [Auto]
tRFC.....................................: 42 [Auto]
tRTP.....................................: 3  [Auto]
Command Rate (CMD) ......................: 0  [Auto]
Channel A  
Channel A Timings Settings   
Static tRead Value......................: 7 

Channel B  
Channel B Timings Settings   
Static tRead Value......................: 7 
  
Motherboard Voltage Control  

Load-Line Calibration.....................: Disabled 
CPU Vcore...............1.22500V..........: 1.42500 
CPU Termination.........1.200V............: 1.280  
CPU PLL.................1.500V............: 1.500
CPU Reference...........0.760V............: 0,810 (63,5%)
MCH/ICH  
MCH Core................1.100V............: 1.480 
MCH Reference...........0.760V............: 0,730 (57%)
MCH/DRAM Reference......0.900V............: Auto 
ICH I/O.................1.500V............: 1,500 
ICH Core................1.100V............: 1,100 
DRAM  
DRAM Voltage............1.800V............: 2,300 
DRAM Termination........0.900V............: Auto 
Channel A Address Vref..0.900V............: Auto 
Channel B Address Vref..0.900V............: Auto 

Advanced Settings  
Limit CPUID Max. to 3.....................: Disabled  
No-Execute Memory Protect.................: Enabled
CPU Enhanced Halt (C1E)...................: Disabled  
C2/C2E State Support......................: Disabled  
x C4/C4E State Support....................: Disabled  
CPU Thermal Monitor 2(TM2) ...............: Enabled 
CPU EIST Function.........................: Disabled  
Virtualization Technology.................: Disabled