[Help] Problems with my overclock ! R3E + 980X !

[PC400]

Hey, guys. Looks like I'm having problems with my computer.

I can't make my cpu stable and all hardware is new!

The maximum frequency that I reached was 4Ghz on 3DMark Vantage with voltages @ auto and temperature @ full load around 52ºC.

Above that, something weird happens and the system crashes at cpu test with less than 1 second running.

I did it all with memories, uncore, qpi, nothing worked.

I use watercooler.. i don't believe that's the matter...

Anyone know what can it be?

Where am I doing wrong??

Checklist:

Cpu configurations: ALL OFF (exceto HT e ALL CORES)
Cpu Voltage OCP: OFF
QPI, PLL Voltage OCP: OFF
CPU PLL: 1.30v
VTT/QPI: 1.35v ~ 1.50v (Unsuccessful)
Vcore: 1.50 ~ 1.65v (Unsuccessful)
Clock testado: 4200mhz ~ 4812mhz (Unsuccessful)
Uncore: 2800mhz ~ 4000mhz (Unsuccessful)
Cpu Ratio: 29 ~ 35x (Unsuccessful)
Load line: Full Calibration
Mode: X-Power
PCI Express: 102
Spread Spectrum / CPU e PCI: Disable
Hardware Prefetcher and Cache: Enable

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That's all that I remember for now.

I updated BIOS, cleared CMOS.

Need help here!

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My config:

Mobo: Rampage III Extreme
CPU: i7 980x #3020A477
Cooling: WC XSPC / Block Heatkiller 3.0 CU
RAM: Supertalent 2000mhz 8-8-8-24
VGA: SLI Msi GTX480 Lightning
Hard Disk: 2 x SSD Corsair Nova 64 | Samsung HD103UJ
PSU: Antec High Current Power 1200w
Case: Microcool Banchetto 101 Clear Modular
Monitor: Samsung B2230
Imput Device: Dell SK® | Razer Mamba™
Audio System: Asus Xonar Xense 7.1 Premium Gaming | Logitech THX Z2300
Headset: Sennheiser PC 350 Xense

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Help-me Please !