How to unlock X2 555 BE on MSI 785GTM-E45?

[VirtualLarry]

It has a BIOS setting for "Core Unlock", and then it has another setting for "ACC", and then it has another setting for "Core Enable".

These are the defaults:

Unlock CPU Core: Disabled
Advanced Clock Calibration: Disabled
CPU Core Control: Auto

I've tried:

Unlock CPU Core: Enabled
Advanced Clock Calibration: Disabled
CPU Core Control: Auto

And I get a black-screen on boot, will not POST, must reset CMOS.

So I've tried:

Unlock CPU core: Enabled
Advanced Clock Calibration:Auto
CPU Core Control: Auto

And I also get a black-screen on boot, will not POST, must reset CMOS.

So I figure I must have at least one, if not two bad cores.

CPU Core Control: Manual, gives two more options, "Core 0:enabled", and "Core 1:enabled". It does not give an option for all four cores, so I cannot selectively disable a bad core.

I search for a BIOS update, but there is non available on MSI's site. No BIOS files at all for this mobo.

Advanced Clock Calibration: has two more options, "All cores", and "Per core", they allow setting the +2 to -2 value range, either for teh entire CPU, or for each core. This setting allows you to select each core out of four.

 

[richierich1212]

Try Enable Core Unlock, ACC all cores -2%, core control auto I think.

 

[angry hampster]

You should have an "EC FIRMWARE SELECTION" setting somewhere. Turn that to "hybrid" and then ACC to "auto"...from there you'll have all four unlocked and hopefully stable.


I couldn't ever get mine stable. I tried just unlocking one core, I tried unlocking both, I tried different clockspeeds and voltages, and nothing worked. Some chips just can't do it.

 

[VirtualLarry]

You should have an "EC FIRMWARE SELECTION" setting somewhere. Turn that to "hybrid"

Nope, that setting isn't there. I'm somewhat assuming that "Core Unlock" does the same thing, but perhaps I'm wrong.

 

[superccs]

Could be you have not upped the voltage to account for 2 more cores running.

I got my cores to unlock with the acc set to auto, and +0.2 volts

 

[VirtualLarry]

Well, I gave up trying with the MSI board and the 555BE. So I built a Gigabyte 785GM-US2H, with a Phenom II X3 720 BE.

I set the EC Firmware setting to Hybrid, set ACC to Auto, and viola, it booted as a Phenom II X4 20. Still haven't stress-tested it yet. Are overclocking stress-test tools good enough to test an unlocked CPU, or are there better tests available? It seems that existing stress-test programs test mainly the FPU, but I want to test the integer pipelines too. I guess Winrar's built in benchmark might work as an integer stress-test.

 

[InfoTiger]

You should try to unlock 555BE with Gigabyte.
It did it for me.