Daily BSODs Win7x64, page fault in non paged area and irql not less or equal

Hello,

Monday i reinstalled Windows 7 64 bits Ultimate Edition after receiving new ram and new motherboard
I have installed Windows 7 64 from USB device, and randomly i have BSODs, PAGE FAULT IN NON PAGED AREA and IRQL NOT LESS OR EQUAL , always caused by ntoskrnl.exe. ( Whocrashed says: "This was probably caused by the following module: ntoskrnl.exe (nt+0x705C0)
)"

It occurs very rarely, not only when i am playing or using programs that use many ressources, It is very random.

I ran:

Memtest : 17 hours, 8 passes, no errors
OCCT: 1 hours, no error, CPU Overclocked and not overclocked, RAM with 1600 Mhz and 1333 Mhz
Furmark ( for GPU): 1 hours, no problems
chkdsk: Done

I have checked temps° with AIDA64, no problems.

Windows 7 Ultimate 64 bits, full retail.

CPU : AMD Phenom II X3 720
PSU: OCZ ModXstream 500 W
Graphics: ATI Radeon HD 6850
ASUS M4A89GTD PRO/USB 3
RAM: Corsair Vengeance 2*4 DDR3-1600 CL9
 
Thank you for the quick response.

Should i increase or decrase DRAM voltage ? and timing? I'm actually at 1.55 V at 9-9-9-24
 
You probably have to choose manual and then just move the voltage up or down a notch or two. Experiment with the settings. Timing looks okay
 
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