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555 unlocked to b55 x4 overclocking

post #1 of 27
Thread Starter 
im a little bit stuck here. my 555 unlocks to a quad with no problems and stays stable up to 4ghz. my 2nd and 4th cores keep throwing errors in p95 after 14k when i clock it up to 4065mhz but at 4050 its rock solid. my nb is at 1.3v at 2700mhz my ht is at 2160mhz at 1.22v and my ram is at 1440 at 1.6v and checks out stable on memtest which it should because its cl8 1600mhz.
im at 270x15 @4050mhz and would like to get it to 4.1ghz. if i adjust the acc from -2 to +12 on my fourth core it stays stable at 12hrs+ p95 but my 2nd core keeps throwing out. and i get weird hangs after 18k and it some times freezes even if i adjust the acc to +12 also ive been getting alot of bsod driver irql errors such as usbport.sys dxmms1.sys but only when i go past 1.5v vid and past 4065mhz.

my questions are should i bump up to +12 on the acc for all cores and try it? also is the errors im receiving due to unstable ram or nb or possibly to much of an oc on the ht? another thing i have an option on my board to up the sb voltage but i dont have an option to oc the sb but from what ive read the acc is linked to the sb. would uping the voltage on the sb possibly help stabilize my oc and help me reach 4.1ghz?

any ideas or suggestions would be helpful.
Edited by ELEKTRIK_BLUE - 2/20/11 at 11:26am
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valkyrja
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post #2 of 27
memtest doesnt check stability only if its good or bad.
from my understanding of what ive read, errors and no crash is memory related.
i would also drop my ht to 1960.
what cpu volts are you at ? whats your temps under load ?
i didnt need to raise voltage for 2640 nb. i dont understand why you raised the volts on your ht either.
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post #3 of 27
I don't recommend passing 1.5V on that motherboard. Otherwise.... let's take out the fire extinguisher!
post #4 of 27
Thread Starter 
im at 1.4875v cpu vid and i raised the ht because i cant stay at stock 2000mhz and with it at 2160 it bsod with hypertransport flood if i dont bump the voltage something i never understood but it worked so i left it. and my next lowest is 1897 i believe and if i go to 1897 i get the most s***tastic performance ever it starts up so sluggish it makes me want to beat it with something.

with my nb i can run 2500 fine on stock but to get to 2600 with out getting memory controller errors in p95 i had to bump to 1.200 i went to 1.225 to get to 2700 but it for some reason now and again would bsod with memory controller errors and uping the voltage seemed to stop the errors.

my highest temp under load so far is 56c but it doesnt stay at 56c for very long my most common temps so far is 53-54c

as for voltage on my old 550 i was running 4.0ghz at 1.55v for 3 months without seeing any problems. my cpu full load temp was at 60c and was unlocked to a b50 x3 however my ram performance sucked i had to go 800mhz 7-7-7-20 to even get it to boot windows
Edited by ELEKTRIK_BLUE - 2/20/11 at 12:54pm
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valkyrja
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post #5 of 27
PLEASE do not run anything over 1.4755 on that board VID wise. There are to many horror stories of MSI boards lighting on fire and taking out entire builds.
    
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post #6 of 27
Thread Starter 
thats really strange to hear because i ran my 550 at 1.475 @3.9ghz for over a year then decided to shoot for 4ghz and i achieved it at 1.55v no fire no sparks no weird happenings it was perfectly fine. and from what i have read its only been people with the 955 and the new hex cores. i haven't read anything about flaming boards on any on the dual core or unlocked cpu's... doesn't mean it hasn't happened but i just haven't heard of it.
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valkyrja
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post #7 of 27
An unlocked 555 is really just an X4 955. No differences.

Now, obviously your mosfets might be able to take 1.55 for a month or two, but it WILL go up in flames eventually. Check out xd_1771's VRM guide and you'll see a ton of horror stories.
    
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post #8 of 27
An unlocked cpu isn't a dual core anymore is it.
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post #9 of 27
Thread Starter 
irregardless none of this answers my questions now does it?
im not trying to come off as an a** or anything im just trying to figure this out and getting frustrated. so i do apologize for seeming like an a**.

that is unfortunate some peoples boards caught fire but im not really to worried about it my goal is to reach 4.1ghz once i get it there and get it stable for 12+hrs im happy then its on to something else. call me what you will be it stupid, stubborn, crazy, ballzy or what have you. i feel confident enough that i can push it to 4.1ghz without needing to pass 1.52v at the very most. i can do 4.0ghz at 1.475v i doubt an extra 100mhz really needs .450 volts. im just trying to figure out whats causing the errors and how to fix them so i can press on to my goal.
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valkyrja
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post #10 of 27
Some chips will need that extra voltage to get just a bit higher. If I were you, I would just stick with 4GHZ or whatever you can get at 1.4775. 100MHZ yeilds very little extra performance, trust me, look at my CPU.
    
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