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[Solved] Cannot OC Processor past 4.1ghz no matter how much increase in voltage

Last response: in Overclocking
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June 24, 2014 2:06:21 PM

Hey guys, I'm having an issue here and need your help. I'm trying to oc my intel 4930k 3.4ghz on a gigabyte x79 motherboard. I can reach an OC of 4.1ghz with lower than stock voltage (1.250), but as soon as I hit 4.2, the system is no longer prime95 stable. The system restarts (no BSOD or freeze) as soon as I start prime 95 small ftt.

--Temperatures are fine as I'm using corsair h110 liquid cooling.
-- Ram is Corsair 4x4gb 1.5v vengence quad channel XMP profile 1877 mhz (tried without XMP as well)
http://www.corsair.com/en/vengeance-16gb-quad-channel-d...

--powersupply: Antec High current gamer 850w semi modular
-- graphics card: asus r9 290x (just one)

I can go ahead and crank up the voltage all I want, but the system does not become stable @ 4.2.

Any suggestions as to what a person should do when a situation like this arises? It seems I'm not capped by vcore or temperatures, but rather, something else?
June 24, 2014 2:10:12 PM

I haven't been an OCing enthusiast for some time now, but typically this means the CPU cut is just not great. It varies per CPU. It could also be a matter of turning off cores to see if multiple cores are limiting the speed. Have you tried reducing the multiplier thus reducing the memory speed in support of higher CPU speeds?
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a b K Overclocking
June 24, 2014 2:14:46 PM

Are you overclocking the base clock or the multiplier?
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a b K Overclocking
June 24, 2014 2:16:40 PM

Some cpus will clock higher than others, some won't oc at all. It's called the silicon lottery sometimes you win sometimes you lose.
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June 24, 2014 2:28:26 PM

I'm overclocking the multiplier. I have it set to 41 so it's giving me 4.1ghz. So it's perfectly normal for a cpu to OC with less than stock voltage but have a random cap at a random OC that's not limited by vcore and temperatures? o.O. Kinda bittersweet, I thought it was a really good chip too for OCing even at 1.150v.
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a b K Overclocking
June 24, 2014 2:30:15 PM

What if you bump the BCLK so that it gives you 4.15ghz? I've heard that playing around with the base clock can help overclocks.
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June 24, 2014 2:32:45 PM

Would that be safe? I'm essentially overclocking the entire system then right?
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a b K Overclocking
June 24, 2014 2:36:09 PM

Yeah, when you do that, make sure only the cpu and RAM is being overclocked, and not the PCIE bus.

Only doing a very small bump of the bclk to make cpu at 4.15Ghz shouldn't hurt anything.
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June 24, 2014 2:47:07 PM

Alright, so I'm going to go into the bios and increase the ratio to 1.xx so that it goes from 4.1 to 4.15. Is there anything else I should do in order to make sure it wont OC the PCIE bus?
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a b K Overclocking
June 24, 2014 2:48:50 PM

in the bios, make sure the PCIE bus is set at it's default speed.
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June 24, 2014 2:58:17 PM

So I checked the bios and:
I can only set the Processor base clock to 1.00, 1.25, 1.66, or 2.50.

I could change the Host/Pci Clock frequency from 100.00 to 10x.xx to get to 4.15, but I believe that is what you are advising me not to do.


Some side notes for my settings:
Cpu loadline callibration 60%
Speed spectrum control - auto

CPU VTT - Auto (1.050v)
CPU PLL - 1.550v
IMC - Auto (0.960v)
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June 24, 2014 3:13:19 PM

Maybe it's my motherboard, the gigabyte x79 has been known for this kinda stuff.

Any suggestions?
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June 24, 2014 5:23:09 PM

bump
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a b K Overclocking
June 25, 2014 12:01:09 PM

update the BIOS.
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June 25, 2014 9:47:46 PM

Thanks for the reply. I had not updated my bios before because all I noticed in the new bios was support for Xeon CPUs. I went ahead and updated the bios, but it didn't help. I have something that may help though?

In the bios, right now I have

"Core current limit: 164 amps"
"Turbo power limit: 130 watts"

Maybe my processor isn't getting enough watts/amps through the psu hence it's restarting in prime 95 without BSOD? Should I change these values? If so, to what?
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June 25, 2014 10:21:15 PM

Figured it out, needed to increase cpu loadline callibration.
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!