im having a little problem wif my e7300.. sometimes it halt when loading windows.. have to restart many times.. and when log in my ram timing suddenly revert back to 800mhz. my ram suppose to run 1066mhz

my spec, e7300,giga ep43-ud3l,Kingston hyperx 1066mhz 5-5-5-18, 450w CM not true power, Zotac 9600gt,160gb hdd,5x12cm fans

my setting, stock vcore, 2.66x10,2.1core for ram.. cpu:ram ratio 1:2

my story begins here, i try to push my proc to 3.2..eventually it failed me sometimes so i revert back to 2.66x10 ( i think dats the ori speed for 7300?)
ram, another problem for me. this ram when i bought suppose to be 5-5-515 timing ori. and only runs 800mhz by default.. as i check their oficial website for setting, i adjust it the same like they recon, 5-5-5-18 , 2.1vdimm..so i could get 1066mhz
agter all this setting i still 'smetimes' get halt when booting and my bios said error due to voltage/settings.. which part i done wrong or maybe some hardwares actually bottleneck my whole rig? psu not enuff juice? or my ram is screwing me around?

anyine could enlighten me?