Originally Posted by marcoabreu
I have a phenom x2 550 (revision RB-C2) board ga-990xa-ud3 and was wondering what I'm doing wrong when unlock the cores in bios.
already put in auto unlock core and windows starts and i go to the net and everything but when I put the prime blocks computer
when i put in three core, windows starts i play fifa, need for speed the run but after a while the computer crashes and reset is the solution. i dont have any blue screen. if i put prime with the youtube computer freezes.
already put the memory voltage 1.6, 1.5 cpu voltage. Nortbrige 1.2 cpu, cpu 1.4 NB Control VDD and HT Link to 1.3.
another thing is that in 2 cores i put the speed of 3.8 and nb to 2700 and ht link to 2700 and computer goes ok with the prime95 and youtube.
Sorry for bad english
Did you use the x2 550 in a previous motherboard where the additional cores did unlock successfully? If this is the first time booting up with that CPU, there is a good chance that the additional cores are actually bad on the CPU. If you successfully unlocked it on a previous board, then at least it gives us a direction to go in.
If it has been previously unlocked on a different board, try setting core unlocker to manual and then enable all 4 cores. Set the CPU speed to stock and start with voltage at 1.4v as a good baseline. Keep HT link at stock and CPU-NB frequency at stock (speed and voltage). NB voltage should be at stock and bus frequency should be stock at 200MHz. The first thing we want to ensure that all 4 cores can be unlocked at stock. With everything stock, except for CPU voltage at 1.4, boot into Windows and immediately rum Prime95 and see what happens.
Should Prime95 run for more than a few hours, reboot and go back into the BIOS and try raising the CPU speed only (using the CPU multiplier). Keep voltage at 1.4v and then go back into Windows and rum Prime95 again. Keep this process up until the system crashes. At that point, raise the CPU voltage another notch and keep testing. With this you should be able to find max stable OC for the CPU unlocked. If you have adequate cooling, you should be safe running the CPU voltage up to 1.5v-1.55v max.