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How much voltage can the i7 920 safely take?

Forum Overclocking : CPUs - How much voltage can the i7 920 safely take?

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aggielaw   06-20-2009 at 01:28:29 AM

Posted this in general discussion, but no help yet, so trying here.

I'm concerned about my CPU voltage.

System 1 (in pertinent part):
Core i7 920 D0
Asus P6T Deluxe v2
Corsair Dominator 1600MHz (3x1GB)
Cooler Master HAF 932
Prolimatech Megahalems
Noiseblocker 1k-2krpm in push/pull config
Corsair 850w PS

CPU-Z readouts:
Bus speed: 200
Multiplier: 20x
CPU Voltage: 1.424v

When I set the BIOS I left the CPU voltage to "auto".

First, is this a safe voltage? Is it likely I can successfully lower the voltage manually in the BIOS? If I attempt to lower it and it fails will I fry my CPU?

And finally, is there a better/safer/more power efficient way to have the D0 hit 4.0 and be stable? I run SETI, so all cores and threads stay at 100% all the time.

Thanks,
HC

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CompuTronix   06-20-2009 at 02:14:29 AM
- 0 +

From Intel's Processor Spec Finder: http://processorfinder.intel.com/d [...] Spec=SLBEJ

All Core i7 variants Vcore Max 1.375

------------------------------ i7 920 @ 4.1 | Vcore Load 1.360
61c CPU & 66c Core @ 22c Ambient
Xigmatek HDT-S1283 | Push-Pull Fans
Core i7 and Core 2 Temperature Guide --> http://www.tomshardware.com/forum/ [...] ture-guide
 Reply to CompuTronix
aggielaw   06-20-2009 at 04:53:56 AM
- 0 +

Ouch. Guess I need to back it off a bit. I don't understand how people are safely getting their D0s over 4 safely.

Thanks for your help!

HC

Reply to aggielaw
cjl   06-20-2009 at 05:09:48 AM
- 0 +

It's very CPU dependent. Some overclock better than others.

------------------------------ Asus P6T deluxe
i7 965 @ 4.2GHz (200*21), 1.384V
12GB Corsair Dominator DDR3-1600 CAS 7
 Reply to cjl
CompuTronix   06-20-2009 at 05:12:42 AM
- 0 +

Many users don't bother to look up Intel's specifications, so some are not getting "over 4 safely". Regardless, D0 Stepping will typically run ~ 200 Mhz faster than C0 at the same Vcore and temperatures.


Message edited by CompuTronix on 06-20-2009 at 05:14:06 AM
------------------------------ i7 920 @ 4.1 | Vcore Load 1.360
61c CPU & 66c Core @ 22c Ambient
Xigmatek HDT-S1283 | Push-Pull Fans
Core i7 and Core 2 Temperature Guide --> http://www.tomshardware.com/forum/ [...] ture-guide
 Reply to CompuTronix
nonxcarbonx   06-23-2009 at 08:28:43 AM
- 0 +

So does going over 1.37 V mean that you cpu isn't safe?

------------------------------ Core i7 920 @3.8ghz|Foxconn Renaissance Motherboard|2 GTX 260s in SLI|750 Watt PSU|6 GB RAM|Windows 7
 Reply to nonxcarbonx
cjl   06-23-2009 at 09:33:33 AM
- 0 +

Well, there's a bit of margin, but I wouldn't go too far beyond it.

------------------------------ Asus P6T deluxe
i7 965 @ 4.2GHz (200*21), 1.384V
12GB Corsair Dominator DDR3-1600 CAS 7
 Reply to cjl
PsychoSaysDie   06-23-2009 at 09:57:45 AM
- 0 +

Running 1.45 in bios at this speed. I am on water. Idle's at 30C, Load's around 65C

------------------------------ Core I7 920 D0 @ 4.2Ghz
MSI X58 Pro-E
32GB SSD, WD Blacks In R0
Sapphire HD 5870's In XFire
 Reply to PsychoSaysDie
Helloworld_98   06-23-2009 at 12:53:13 PM
- 0 +

i7's have very different overclocks, my D0 hits 3.8ghz max at stock volts but it gets to 80C whereas some D0s will hit 4.2ghz stock volts at 60-65C

Reply to Helloworld_98
c0der1020   06-23-2009 at 05:22:28 PM
- 0 +

Intel has from my experience always set their Vcore max very low. I guess just to be absolutely sure that noone can fry their CPU as long as they stay within that limit.
That doesn't mean that running 1.424v would fry your cpu for sure though.

What you suggested yourself is the way to do it. If your cpu runs fine now try and lower the voltage bit by bit and run some benchmarks. When you get a failure you go back up one increment and then run some hourlong tests to make sure it's stable.

Failure from too low voltage doesnt fry your cpu. It just means that there isn't enough juice to do the calculations which doesn't harm the cpu.

Reply to c0der1020
cjl   06-23-2009 at 09:07:25 PM
- 0 +

True, although you can corrupt your OS install from crashes from too little voltage.

------------------------------ Asus P6T deluxe
i7 965 @ 4.2GHz (200*21), 1.384V
12GB Corsair Dominator DDR3-1600 CAS 7
 Reply to cjl
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