i got a A-Data Vitesta DDR2 800+ Extreme 2GB Dual Kit
my motherboard is Asus p5n e sli and the cpu is q6600

Problem is:
If i put the memory in dual channel and the system freeze
If i put the memory in dual channel and i overclocking with 5%(or ohter procent) the system work's
If i put the memory in single channels the system work'

P.S: my S.O is vista x64
the motherboar show me that the memory are in 5-5-5-18(the real is that the memory are 4-4-4-12), i modified the 5-5-5-18 into 4-4-4-12 manual and i set the voltage on memory at 2.085 volts and ai start the system...and the result are: system freeze until the boot...(until the detect of hdd(seagate 160gb s-ata 2))

Any solutions?