Before=stable@aircooling - now=unstable@watercooling

[njl]

System before:

Gigabyte GA-EP45-UD3P (bios f5b)
Q9650 E0 ES
4x2GB Corsair Dominator PC8500 DDR2
3xWD Raptor 150 ADFD Raid0
1xHitachi Deskstar 320
2xNEC 3550 DVD/RW
XFX Geforce 8800GTS (G92) 512MB
FSP Epsilon FX700 700W PSU
Thermalright Ultra Extreme 120 w/2xSharkoon Eagle 2000 push/pull
Thermalright HR05 w/Sharkoon Eagle 1000 on NB
Antec P180 w/3x 120mm case fans running at full
Vista Ultimate 64bit

Running stable@4.25GHz (8.5x500) @1.4V approx 65 degrees


Now with these upgrades:

Club3D 4870x2 (bought used) w/latest drivers
Thermaltake Toughpower 1200W CableManagement (brand new)
Swiftech 655 (new) @5
TFC 480 w/8xYate Loons DL12 push/pull @1000 RPM (new)
Swiftech GTZ (new)
XSPC X20 Delta Chipset (new)
EK 150ml res (new)
Masterkleer 11.1mm ID tubing (new)
EK ½" highflow barbs (new)
Antec P180 w/2x casefans running at low
2x 80mm Sharkoon Eagle 100 directed at memory running at full (new)

somewhat stable @stock running prime approx 45 degrees
always crashes sometime during HD id / windows bootup at e.g. 4.25GHz

I'm completely baffled that this rather expensive upgrade seems to have gone wrong.

Ambient is approx 21 degrees celsius

The watercooling setup has been bled and are completely airfree.
It's demineralized water w/feser base corrosion blocker.


Things I've noticed:

I can boot at stock settings and it seems to be stable running prime (at least for 15 mins).
Everest and HWmonitor both reports +12V at 0.15-0.9V, however BIOS reports it at close to 12V at boot.

I had placed one of the cushion mats for the nb block under the XSPC X2O Delta and thought it might be that it prevented proper contact so removed it - no change.

I had connected the 8pin mobo connector to the mobo, but doublechecked the mobo manual and found that it should be the 2x4pin mobo connector instead so changed to that (everything turned off naturally)
Can I have fried something on the mobo when booting with the 8pin?

Any ideas are VERY appreciated.

Thanks