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Dropped Prime95 Cores on OC'ed FX8120

post #1 of 15
Thread Starter 
Hey guys,
Been using this rig for overclocking for sometime, and after initially clocking it everything worked out great, but when i ran prime95 for the sake of it two cores dropped with a fatal error saying how it expected a certain number but got another. I ran it a second time to check and it happened again but this time they dropped straight away.

Just wondering how i can solve the problem? my FX8120 gets to 39 degrees so i dont think its heat. Here are some specs;

VCore: 1.250
Core Speed: 4Ghz
Multi: x20.0
Bus Speed: 200.66Mhz
HT Link: 2207.39Mhz

Any help would be appreciated smile.gif
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post #2 of 15
Give it more voltage. 1.25 volts is way low.
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post #3 of 15
hello,
1.284v and ultra high cpu llc smile.gif
another way is to disable everything on the cpu advanced tab except cool and quiet,
disable that turbo core and change your multi to 20x, cpu load line to ultra high, voltage off-set to -0.025v,
and it runs at 4ghz,change windows power option to balanced.
lose a little performance from the clock change but the down clocking will save a load of cash in electric.
when testing, turn the power option to high performance
Edited by MrPerforations - 5/31/13 at 10:55pm
    
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post #4 of 15
Thread Starter 
Quote:
Originally Posted by OzzyRuleZ View Post

Give it more voltage. 1.25 volts is way low.

Ah yeah that seems about right, how much should i crank it? And is it better to just clock the multi and leave the HT & bus speed for later?

@MrPerforations
Yeah i will have to double check all my settings, i did have those as you recommend but i'd had to reset settings a fair few times so i'll check smile.gif
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post #5 of 15
I would start at 1.35 and see how it is if it does prime a few hours back it off a little and repeat testing until it fails then go back up one. If its not bump it up a little, rinse and repeat as necessary. Its easier to just use the multi to overclock. When you overclock using the bus then you have to take the CPU-NB, motherboard NB and memory speeds into account. It can make it much more difficult to get it stable. However you can get a bit more performance out of it using the bus but you have more things to get stable. A lot of guys use a combination of multi and bus for max performance.
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post #6 of 15
Thread Starter 
Quote:
Originally Posted by OzzyRuleZ View Post

I would start at 1.35 and see how it is if it does prime a few hours back it off a little and repeat testing until it fails then go back up one. If its not bump it up a little, rinse and repeat as necessary. Its easier to just use the multi to overclock. When you overclock using the bus then you have to take the CPU-NB, motherboard NB and memory speeds into account. It can make it much more difficult to get it stable. However you can get a bit more performance out of it using the bus but you have more things to get stable. A lot of guys use a combination of multi and bus for max performance.

That's what i did initially with the voltage bumps, and this voltage is totally stable for me 24/7 its just the prime cores and seeing as i wanted to try a little more i wondered if its really an issue? Won't hurt taking it to 1.3 though!
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post #7 of 15
Really as long as you aren't experiencing any crashing in what you do daily it *should* be ok. I personally don't feel right about it unless it can do at least 8 hours of Prime. All it takes is one error modifying a system file to kill an OS install.
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post #8 of 15
Thread Starter 
Quote:
Originally Posted by OzzyRuleZ View Post

Really as long as you aren't experiencing any crashing in what you do daily it *should* be ok. I personally don't feel right about it unless it can do at least 8 hours of Prime. All it takes is one error modifying a system file to kill an OS install.

Yeah it definatly needs work, i was playing minecraft earlier (i know i know) while on skype and had speedfan open to monitor the load on the cores and it wasn't even using four of them and then decided to drop another core that was using skype. Helpful.
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post #9 of 15
Thread Starter 
UPDATE:

Just had had a tinker with my settings and so far so good, no dropped cores after 5-10mins on prime95 and temps not exceeding 40degrees. I just wondered if anyone had any ideas on how to improve on this, or suggest anything to take it further smile.gif

BIOS Settings;
CPU Ratio: 20.0
Bus Speed: 200Mhz
PCIe: Auto
Memory Clock: 1866Mhz
CPU/NB: 2200Mhz
HT Link: 2200Mhz
CPU Spread Spectrum: Off
PCIe Spread Spectrum: Off
EPU: Off (of course)
CPU LLC: High
CPU/NB LLC: High
CPU Power Phase: Standard
CPU Voltage Frequency: Auto
CPU Power Duty Control: T.Probe
CPU/NB Voltage: Manual (Option of manual or offset)

And i thought i'd just mention that i've got 4Ghz with 1.30 VCORE, and HWMonitor says that under load i pull 1.260v, so i don't know if thats vdroop or what as i believe idle it pulls 1.248v.

Any help would be am-azing.
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post #10 of 15
Thats normal. Ultra High in LLC is usually the setting thatll let your actual voltage stay about where you set it in the BIOS. I have mine set to 1.39 in the BIOS and it hits 1.40 under load according to HWMonitor.

If youre dropping cores, then your clock isnt stable even if its not crashed on you during daily use.
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