ASUS Striker II Extreme

[gcardinal]

Hello guys... I am really stuck!

My bench:
OEM Intel E8500
OCZ DDR3 PC3-14400 1800MHz DDR3 CL 8-8-8-24 1.95 Volts
Asus Striker II Extreme - 0704 (no corruption problems)

I have been testing all kind of different voltage settings for a week and I just cant get it 100% stable.
When I run 1.48 on NB it does calculate 1M SuperPi, but prime95 is an instant crash.
With 1.50 on NB (1.60 on SB) I can run prime95 for like 20min then it gives calculation error.
On all settings Crysis does crash in 5-30min - never got more then 30min of gameplay.

My most "stable" settings to date:

9.5 x 450 - 1800
CPU Voltage = 1.45
Loadline Calibration = disabled,
CPU PLL Voltage = 1.58
CPU VTT Voltage = 1.34
Memory Voltage = 1.96v
NB Core Voltage = 1.50v
SB Core Voltage = 1.60v
CPU GTL REF0 Ratio = Auto or +42
CPU GTL REF1 Ratio = Auto or +39
CPU GTL REF2 Ratio = Auto or +39
CPU GTL REF3 Ratio = Auto or +42
NB GTL REF Ratio = +40

I have h2o on MB and CPU and general quite nice air cooling, still NB gets to 50C after boot.

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What can I do to get it stable? I have tried like 40 configurations on volts and FSB but it just never stable.
What is the path to test it and to find the problem? You can say I am a bit of a noob on Intel OC

Can it be bad MB or it just stupid me?

thx