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X2 555BE unlocks to X4...sometimes

post #1 of 11
Thread Starter 
I have this 555 I've been using for a couple weeks, and it unlocks to 4 cores and runs fine (ran prime and occt) with everything set at stock settings. But there's 2 issues.

1. if it goes to sleep, it doesn't come out nicely; ends up rebooting so I disabled sleep in windows. I can mostly live with this.

2. When I reboot or restart Windows, it doesn't always come up with 4 cores. Sometimes it comes up with 2 and I'll restart again and there'll be 4. This one bugs me more.

I've upped the cpu voltage to 1.4v, but same difference. Is this the motherboard or cpu?
TCx I
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TCx I
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post #2 of 11
Hmm, this sounds either like a motherboard or OS issue.

Try updating the BIOS, that may help.
post #3 of 11
Probably not gonna work as a everyday quad. Try opening 3 cores only. You may have to experiment with the 2 cores that were disabled and see which one is not gonna work right. I had same issue with a 555 before. Finally I got it to boot as a quad and went in bios and disabled 3rd core and used cores 1,2 and 4 with no problem.
post #4 of 11
If a core was unstable prime should have shown it fairly fast with a checksum error, how long have you ran each program?
post #5 of 11
Quote:
Originally Posted by luckypunk View Post
If a core was unstable prime should have shown it fairly fast with a checksum error, how long have you ran each program?
I dont know. In my experience with unlocking cores sometimes they can run fine on P95 for a while, then the next day you can try it again and it might fail within seconds at same settings. Unstable cores act a lot different then an unstable OC.
post #6 of 11
Thread Starter 
(Happy B-day, Chuck!)

I ran Prime95 for a little over 2 hours, and OCCT for 1 hour twice. I've also used it unlocked for several hours while working (eclipse, compiling, jboss, jmeter, putty). Never had a bsod.

Motherboard bios is the latest F5, iirc, from 09/10.
TCx I
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PhenomII X2 555 BE Gigabyte 880GMA-UD2H igp 2x4GB DDR3 1333 (Corsair XMS3) 
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WD 7200rpm 320GB Win 7 Pro 64 300W Athena SFX slim mATX 
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TCx I
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PhenomII X2 555 BE Gigabyte 880GMA-UD2H igp 2x4GB DDR3 1333 (Corsair XMS3) 
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WD 7200rpm 320GB Win 7 Pro 64 300W Athena SFX slim mATX 
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post #7 of 11
Then yah, it may just be one of the cores isnt completely stable. run prime 95 for 8 hours, and if you recieve a checksum error on either core 3 or 4 (however since the first core is core 0, then the 3rd and fourth will actually show as core 2 and 3 in prime, bios, etc.) you know which one is the "weak link", from there you can disable the specific core in the bios and hopefully have a fully stable x3 chip.
Edited by luckypunk - 4/21/11 at 3:38pm
post #8 of 11
My unlocked 555 has exactly the same problem when restarting, sometimes it reverts to x2 mode.

It doesn't seem to be a unstable core though, when I unlocked/overclocked the cpu I passed a few Prime95 runs (including a 48h run), plus several IBT/OCCT/Linx runs of about 1-2 hours. Recently it passed again a 24h Prime95 run. Plus it's folding 24/7 without any problem.

I'm by no means an expert, but as long as it is Prime95 stable, and doesn't give any other problems, I wouldn't lock back cores. The dual/quad core restart thing is annoying, but takes at most 2 mins to reboot the computer again. Also if you're at your computer during the reboot you can enter to the BIOS fast, then reboot and it will be back at x4.
Dustbox
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Dustbox
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post #9 of 11
Thread Starter 
Just got done with a 5.5 hour Prime95 run without trouble.
Quote:
Originally Posted by Casjo View Post
My unlocked 555 has exactly the same problem when restarting, sometimes it reverts to x2 mode.

It doesn't seem to be a unstable core though, when I unlocked/overclocked the cpu I passed a few Prime95 runs (including a 48h run), plus several IBT/OCCT/Linx runs of about 1-2 hours. Recently it passed again a 24h Prime95 run. Plus it's folding 24/7 without any problem.

I'm by no means an expert, but as long as it is Prime95 stable, and doesn't give any other problems, I wouldn't lock back cores. The dual/quad core restart thing is annoying, but takes at most 2 mins to reboot the computer again. Also if you're at your computer during the reboot you can enter to the BIOS fast, then reboot and it will be back at x4.
Looks like we're in the same boat, Casjo. Interesting that we both have Gigabyte boards, eh? Wish I had a different manufacturer's board to test with just for curiosities sake...
TCx I
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CPUMotherboardGraphicsRAM
PhenomII X2 555 BE Gigabyte 880GMA-UD2H igp 2x4GB DDR3 1333 (Corsair XMS3) 
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WD 7200rpm 320GB Win 7 Pro 64 300W Athena SFX slim mATX 
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TCx I
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CPUMotherboardGraphicsRAM
PhenomII X2 555 BE Gigabyte 880GMA-UD2H igp 2x4GB DDR3 1333 (Corsair XMS3) 
Hard DriveOSPowerCase
WD 7200rpm 320GB Win 7 Pro 64 300W Athena SFX slim mATX 
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post #10 of 11
delete the processors in device manager and reboot.

if your gonna be switching back from 2 cores to 4 cores, your gonna have to do that every time.
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