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How can I push my overclock further?

post #1 of 5
Thread Starter 
So, i got my i7 920 at 4ghz (21x190) at 1.28volt, with ram set to just under 1600mhz and 7-7-7-20, which is what its rated at. It runs fine at this my pc, but soon as I try go for 4.2ghz I hit a massive wall and end up needing best part of 1.4v for it?

Why is that? Ive tried running my ram super lose, high timings to compensate and doesnt seem to work? Coudl it be that my ram is the problem here, or I simply have a unlucky chip that wont go past 4ghz?

thought please

thanks!
post #2 of 5
My i7 920 has very similar prob, my i7 will do 4.2Ghz but need MASSIVE qpi volts to run my RAM at 2000mhz

Am going to fiddle some more when my rig is up and running but my W/C just leaked so gona let my whole rig dry

Mikrouwel
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SyncMaster P2250 (1920x1080) Razer Nostromo Coolermaster 1250W Cosmos II 
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post #3 of 5
Thread Starter 
Hmm, I leave 90% my settings at auto, only things i ever change is the obvious cpu volt and then the ram volt to 1.66, you reckon the others need changing?
post #4 of 5
bump up "cpu pll" and "pch core" to see if that gets rid of the inconsistency.

DO a full shut down and wait a few moments to make sure your settings in the bios are solid.

in your case it would be this
"CPU PLL Voltage: You might need to increase this value when overclocking. Some people have found keeping this value at stock or even lower values helps achieving higher clocks. Don't over-volt this value a lot as it could quickly cause CPU degradation/damage. Leaving this in Auto-mode should be enough for 90% of our readers.

IOH Voltage: This value can help reach high BCLKs. Normally, letting it on Auto mode is enough.

ICH Voltage: It's best to set this on auto, as it powers the chip that keeps the communication from the CPU to peripherals. "

quoted from http://benchmarkreviews.com/index.ph...=583&Itemid=38
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Casmatic
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post #5 of 5
Probably the cpu, most i7s seem to scale well up to a certain point then need larger amounts of voltage to go further. My 920 scales pretty well up to 4.2Ghz, just need small increases up to 1.248V for 4.2 w/ HT, after that I need to up the voltage much more, ~1.386V for 4.4Ghz, ~1.525V for 4.6Ghz, etc.
Cpu pll can have some effect, on my classified cpu pll @ ~ 1.5 - 1.6V seemed to work a bit nicer, although I've never had to increase it from stock 1.8V (auto) on any board.
    
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