Sorry if these replies seem brief. I've been really busy lately and haven't had a chance to update this guide much.
Originally Posted by Bkobe7
Hello, new Phenom II owner here. Also, new board to add to the list...CPU-Z attached. I’ve successfully unlocked the 2 dormant cores and am currently stuck at trying to get my system stable at 3.4Ghz.
- Processor Frequency Multiplier: [x 17.0]
- CPU/NB Frequency: [Auto]
- CPU Over Voltage: [1.3750]
- VDDNB Over Voltage: [1.175V]
- CPU VDD Voltage: [Auto]
- LoadLine Calibration: [Auto]
- All options in ‘Hyper Transport Configuration’ and ‘Chipset Voltage’ left on [Auto]
- Core Voltage bouncing between 1.296V and 1.360V during Prime95 blend test (Is this Vdroop??)
- Bus Speed: 200.9
- HT Link: 2008.9Mhz (Reported by CPU-Z)
- NB Frequency: 2008.9Mhz (Reported by CPU-Z)
Prime95 blend test lasted ~2 hours before rebooting. All I did was come back after 2 hours and move my wireless mouse causing it to wake from sleep mode and my system to reboot. In previous tests using the same settings, I would be able to trigger a BSOD/reboot just by starting a particular youtube video during the 2nd test of Prime95 small FFT (10k?).
I tried increase CPU/NB Frequency to [x 11] (2200Mhz) and using a VDDNB Over Voltage setting of 1.25V but that caused a BSOD after just 1 hour so I decided to go back to working with [Auto] for CPU/NB Frequency and VDDNB Over Voltage.
How do you explain the symptoms aforementioned? What should I try next?
Like any good science experiment, change only one variable at a time. Here's how I would proceed:
1. Stability test system at stock settings.
2. Test system with cores unlocked at stock frequencies.
3. Test system with multiplier increased. Increase multiplier by half step, test, and increase voltage by one step if fails. Rinse and repeat. I know this is tedious.
4. Test system with cpu-nb multiplier increased (Depending on your chip, it may not overclock well. Remember they are dual-cores for a reason. Either the core was defective, or the cache was. In your case, very well may have been cache defective.
5. Test system with CPU AND CPU-NB multiplier increased.
That Vdroop isn't looking very good. Then again, you can't rely on software. 100% sure check is with a multimeter.
Originally Posted by Dick Bush
Hello all, i've been trying to unlock my 550 with a M4A785TD-V EVO. In bios changed only ACC --> auto and enabled unleashing mode. Saved and exited, then my PC shuts down for a few seconds and tries to start up once again. It just tries for a few secs and shuts down right away.. Cool & quiet or +2 per core (2&3) doesn't affect in any way.
MB: M4A785TD-V EVO
Bios Version: 410
Cpu: Phenom II 550 BE 0929DPMW
OS: Windows 7 Ultimate
In a case like this, what should i try next, if anything? I'm wondering, could it be my unorthodox mobo power plug, because it's like this
All help appreciated! Edit:
Latest bios didn't work either.. Thanks anyway!
How old is your power supply???? 24pin ATX power plugs have been standard since 5 years ago??? You're definitely due for a new one. Pick one up with so many black friday deals going on. You can't go wrong with Corsair PSUs. I honestly don't think your mobo is getting all the power it needs from that old PSU you're using.
Originally Posted by Symon123
HEllo all , Trying to get a little help here as i am new to this whole onlocking/overclocking thing! I have the 550be- msi 790-fx-gd70 board. I have upgraded the bios to 170, set unlock coores to enebled , acc to suto , all coors , per core . I have even messed with voltages to some degree, well till it wouldn't post
Just wondering if anyone out there has a similiar board and could give me some ideas as to what to try next! I do however relize i may just have to be happy with my dual core over clocked , i have it to 3.6 now on default power , nice and stable !
Any help would be greatly appreciated, Thanks!
Unlocking is really simple. You're pretty much tried all you can try. As a last attempt you can try to downgrade your bios to 1.52 and see what happens. Download link is in OP.
Originally Posted by Stylez777
Hi guys new Phenom II x2 550be owner and new to the forums.
Was toying around with unlocking the 4 cores and believe I have done so but with a little issue was wondering if someone could help with.
MB:Asus M4A79XTD EVO
Bios: 0605 (latest Bios)
cpu: Phenom II x2 550be
OS: Windows 7 Ultimate 64bit
Vcore = 1.4v
Windows loads up every time and I have not gotten any BSOD's but when I run prime95 right away I get an "illegal sumout" error on worker #4 and it stops working. The other 3 workers continue to work. I'm really not sure what this means (does it me the 4th core won't work stable?) and what to do about it? I got this error when I had the Vcore set to 1.35v also then upped it to 1.4v same thing. Do i leave the NB volatge at auto in the bios and only try to up Vcpu-nb?
I've attached some screenshots if anyone could give some suggetions/explinations that would be a huge help.
Sorry, but it looks like your 4th core is toast. Is there a core-levelling option in BIOS? Disable core 3 and run stability test again. You still win an extra core.
Originally Posted by Bkobe7
Was able to experiment with individual core multipliers with AMD Overdrive and found I could get core 0 and 1 to 3.4Ghz stable while keeping core 2 and 3 at 3.3Ghz.
NB won't go any higher than stock even with 1.25V. Any suggestions?
See first reply as to why. You can try up to 1.35v for CPU-NB, but it is up to you whether you want to add more heat/stress to your chip.
Originally Posted by onoz
Hey! Thanks for your post OP! I've tried to unlock my 720 with no success, but i didn't know until i read this post that upping the voltage could increase my chances!!! I'll try it and let ya'll know if it works =)
Edit: Will Intel Burn Test be good enough to test my unlocked core or do I really have to use prime95 and those other ones?
I don't like using IBT because I honestly don't believe it stresses the cpu-nb very much. IBT is useful as a quick check before you start your 8hr Prime95 run though. Set IBT for max memory/20 passes to check for initial stability. If you're unstable, it will crash pretty quickly. From personal experience, if IBT doesn't crash your computer, Prime95 will do it, so don't rely on IBT alone.Edited by raxen - 11/27/09 at 9:34pm