OC 4400+ , dfi ultra-d, gskill pc4000 F1, need help

[Shogo]

Ok i have a bit of free time now so im back on trying to figure out whats the weak point in my overclocking

I am using the new 706 bios for dfi ultra-d.

I am using the recommanded settings from gskill rep :
voltate 2.6v
CPC: enabled
TCL: 3
TRCD: 4
TRAS: 8
TRP: 4
TRC: 7
TRFC: 14
TRRD: 3
TWR: 2
TWTR: 2
TRWT: 3
TREF: 3120
TWCL: 1
BANK INTERLEAVE: enabled

Skew: auto
value: 0
dram strenght: auto
dram data : auto
idle cycle limit: 16
dynamic counter: enable
16x
7x
disabled 4 burst

I cannot pass memtest #5 at 250fsb (cpu multi tuned down to 6x just to be sure my cpu wasnt causing problems) at 240fsb i can pass #5

now i tried to get into windows with 240x10, fine, 240x11, blue screen of death.

i cant even reach 2600mhz, it kind of sucks? cpu voltage is 1.3725
HTT link is set to auto.

so, i have bad ram and a poor ocing cpu? Prime 95 is passing 6hours but crashes after that.