cosworth4x4

my psu is a oryxx ox650-sd

hi when my graphic card is at default settings the screen goes black for about 2-3secs then comes back and will keep doing it but when i drope the core speed down it works fine bits slow but bearable iv phoned overclockers about the memory and they say its my motherboard thats at falt but i dont get it with the graphic card underclocked and 2gig of the ram everything is fine its just when i have all 4gig in i have truble windows no's that there is 4gig and rate it at 5.9 and my motherboard no's that there is4gig in as well very very confussed

hi iv found a program called memtest86 iv ran it on each 1gig stick and all 4gig seems fine to me i just dont understand it , it should be working

hi thx for the advice but im still not getting anywere iv played with timings and the volts but with no improvment the max volts i can go to are 2.05v iv tested each 1gig stick on its own and they all work fine ,im really at a lose chould it be my graphic's card iv got HIS turbo ice3 x1950pro that has never worked right it should run at default 622mhz core 742.50mhz iv had to underclock it to 600.75 left the mem at default to stop it crashing

i have just bort 4gig of OCZ 2GB (2x1GB) PC2-6400C4 Dual Channel Platinum Revision 2 XTC Series DDR2 (OCZ2P800R22GK) to go on my ASRock ALiveXFire-eSATA2 - Motherboard - ATX - 480X CrossFire - Socket AM2 i have an athlon64 x2 4200 am2 cpu 2 gig of the memory works fine no problem daul channel and 3gig single channel but with the 4gig in windows is fine but on any game i load i get really bad glichy lines and computer freezes please help as my foot isnt far from my machine

hi im steve im 28 i dont no much about computers but i am trying to build my own