If the CPU was previously stable, were you using different RAM?
(assuming the answer is 'yes') Are you overclocking the CPU? If so, that could be the cause of the instability and the new RAM has exposed it somehow. Have you tried resetting the BIOS settings and starting over on your overclock testing? This is what you should do whenever you change a critical component like RAM.
No changes, I was having stability issues before and setting the ram manually to 1333 seemed to fix it but now its ignoring the bios setting. No over clocks and bios is at default except ram settings mentioned above
Try reseating the RAM, resetting BIOS, and then setting the relaxed timing settings You should just lower the memory bus setting first before you start playing with refresh timings. Change one thing at a time to make it easier to figure out exactly what works.