Blue screen with some kind of IRQ_... (collision?) please help...

Hey all,
I'm sorry for not being more active here.
I have just assembly new computer:

Gigabyte MA79X-UD4P, with Phenom II 940,
OCZ Blade edition DDR II, 2x2GB1066 (on channels 1+2, on 128bit configuration) - According to webstie, suppose to be 2.1V


Sapphire HD4870 1GB DDR5
two WD500GB
Antec 900
HEC Couger 650W

and Vista Ultimate 32bit + SP1.

Every now and than (also during driver installation), everything shuts, and a blue screen appears, talking about some IRQ something. so, I guess it's a collision of drivers, or. as I read here - something about the memory? (though it's brand new!)

I beg you for assistance on identifying and solving the problem.

Update: looking at the website and according my CAT#, I have confirmed that this module requires 2.1V - 2.15V, while my MB supplied 1.8V only.
I have increased by +0.3V to 2.1V (well, 2.144V).
should it solve it?

P.S.
Same Power supply, same Vista, same HD4870 was assemblied on Gigabyte P35-DS3L with E6750.
never had this problem...

Thank you so very much
Z