I have a Phenom II X2 555 Black Edition on an Asus M4A87TD/USB3 board (cpu unlock ready).
The cpu is unlocked and now it's the Phenom X4 B55. (runs @ 3.2Ghz, native speed).
Computer runs without any problems whatsoever! All goes with normal temperatures also.
System is Windows 7 64bit.
The problem is the following - I started the computer yesterday and got a massage "3 Cores Activated" on the first screen, instead of 4 as always is written. I checked in Windows task manager, CpuZ, Speccy...
everywhere the same - 3 cores only.
Then I updated the Bios to the newest version, restarted the machine and everything was back
to normal. Computer reports "4 Cores Activated", Windows, CpuZ... everywhere, again - all 4 cores
My question is - what could be the problem?
What can couse such behavior?
Only thing changed to computer prior to the problem was installing the Prince of Persia
You say the cpu was unlocked was it fully tested for stability?
Does it run with cool n quiet enabled or was a voltage increase needed for the unlock as many need this?
Test the cpu by running OCCT for 1hr and Prime 95 for 8 hrs and monitor temps.
If it fails either you know what your problem is. You will then need to start increasing voltages to gain total stability.
You will need to monitor temps with occt / hwmonitor or speedfan, remember you won't get a reading for each core as unlocking screws up the temp sensors, you will need to run occt and watch which temps increase after 1 min, these will be you cpu temps and the ones you need to watch.