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Problems with Unlocked Phenom II

Last response: in CPUs
February 9, 2011 8:18:26 AM

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
are present.

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 :) 

Thanx in advanced!!!!!
February 9, 2011 11:02:02 AM

The reason they disable a core is because they may be faulty.

When you decide to unlock a core you have to understand that it was disabled for a reason and any functionality you may get may not be optimal for what you are trying to achieve.

This is especially true if you go from a X2 to X4.

Just because something says you can unlock an extra core or 2 doesn't mean it will work.

You will have to live with that your Phenom X2 may only be able to be a X3.
February 9, 2011 11:16:20 AM

Ok, thanx! I have a 3 year warranty for Unlocked CPU so if that's the case, I have a backup for few years.
The CPU was unlocked by computer store.
Related resources
a b à CPUs
February 9, 2011 11:30:03 AM

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.
February 9, 2011 11:39:49 AM


Thanx A LOT!!!! I'll run all test you've wrote and check what's the bug.

Maybe I'm having a problem with my low budget 500w PSU.
a b à CPUs
February 9, 2011 11:43:16 AM

Whats your psu make and model and rest of system specs?
February 9, 2011 11:56:41 AM

BlueBerry 500W PSU
ASUS 5770 1Gb
Kingston HypeX DDR3 4Gb
WD 500Gb

I noticed in Bios that the memory has vary bad latency so I figured it's because of low quality PSU.
a b à CPUs
February 9, 2011 3:06:08 PM

Is this it?

Your setup should be fine on a decent 500w psu, the one above seems ok.

You should set you mem timings and voltage manually to what it should be then test with memtest and occt.

The psu shouldn't effect the memory.